license problems "cheat sheet"

It can be a nuisance to find the meaning of the various license manager error codes, so I have summarized below. Numbered error codes that are not LME errors are listed in the table after that.

In many cases, the error number will be displayed twice to the user, with the first version being the major error number (such as "Error -15") and the second (less obvious) occurance having a more specific subcode (such as "Error -15,570") that acts to narrow down the cause of the error. In the below list, when subcodes are not known for a cause, the known causes are listed under the major error number; but when the subcode is known for the cause, the more specific cases are listed in numeric subcode order. This includes, for example, that the major cause of major error -9 is not listed directly in the error -9 paragraph, and is instead listed immediately afterwards in the error -9,57 paragraph. If you do not have a subcode available, review all of the entries with the same error major error number.

• error -1: cannot find or read license file https://www.mathworks.com/matlabcentral/answers/101018-why-do-i-receive-license-manager-error-1; or PLP misentered or for wrong version https://www.mathworks.com/matlabcentral/answers/94774-why-do-i-receive-an-error-1-after-entering-my-plp-during-a-windows-installation-of-matlab (Note there is also error 1731 that could be confused with -1,xxx errors.)
• error -1,714: MAC problems https://www.mathworks.com/matlabcentral/answers/100235-why-can-t-i-activate-matlab-or-start-the-license-manager-in-a-newer-linux-environment#answer_220657
• error -2: polyspace license file error https://www.mathworks.com/matlabcentral/answers/101696-why-does-polyspace-become-queued-due-to-license-failure-and-my-log-files-contain-a-license-manager
• error -2,413: extra cr or newlines in license file https://www.mathworks.com/matlabcentral/answers/94656-why-do-i-receive-license-manager-error-2;
• error -2,753 : you do not need to activate this license. https://www.mathworks.com/matlabcentral/answers/2176070-why-do-i-receive-error-2-753-this-license-does-not-need-to-be-activated-when-activating-matlab
• error -3: DAEMON line is wrong on server https://www.mathworks.com/matlabcentral/answers/101344-why-do-i-receive-license-manager-error-3
• error -3,121 environment variable not set right https://www.mathworks.com/matlabcentral/answers/100948-why-do-i-get-license-manager-error-3-when-i-try-to-use-the-matlab-compiler
• error -4: polyspace https://www.mathworks.com/matlabcentral/answers/215635-why-do-i-receive-a-license-manager-error-4-in-polyspace ; webapps not shut down: https://www.mathworks.com/matlabcentral/answers/2174566-license-manager-error-4-if-matlab-web-app-server-is-not-stopped-before-computer-is-shut-down
• error -4,0: all licenses for toolbox are checked out https://www.mathworks.com/matlabcentral/answers/101313-why-do-i-receive-the-error-license-manager-error-4
• error -5: misconfigured for redundant servers https://www.mathworks.com/matlabcentral/answers/293231-why-do-i-receive-license-manager-error-5-when-using-redundant-servers; or redundant server bug in R2016a https://www.mathworks.com/matlabcentral/answers/293224-why-do-i-receive-an-activation-loop-when-using-redundant-servers ; or port conflict, or need to update flexlm https://www.mathworks.com/matlabcentral/answers/93789-why-do-i-receive-a-flexnet-licensing-error-17-xx-system-error-10054-winsock-connection-reset
• error -5,357: product you are not licensed for https://www.mathworks.com/matlabcentral/answers/98719-why-do-i-receive-license-manager-error-5; or you asked for license diagnostics https://www.mathworks.com/matlabcentral/answers/163423-why-do-i-receive-multiple-license-manager-error-5-s-for-products-not-on-my-licenses-when-starting-m
• error -7: used to be you need to update the license server https://www.mathworks.com/matlabcentral/answers/216384-why-do-i-receive-license-manager-error-7 but now is license daemon problems
• error -8: corrupt license file, or license server hostid not same as license file https://www.mathworks.com/matlabcentral/answers/100496-why-do-i-receive-license-manager-error-8; or flexnet bug for redundant servers https://www.mathworks.com/matlabcentral/answers/103212-why-am-i-getting-a-license-manager-error-8-when-running-redundant-servers; or bug that affected locale Turkey https://www.mathworks.com/matlabcentral/answers/357580-why-do-i-see-license-manager-error-8-when-launching-matlab-on-linux-when-my-locale-is-set-to-turkey; or attempt to use cracked license
• error -9: you may need interface en1 for Mac or disk serial number with leading 0 for Windows https://www.mathworks.com/matlabcentral/answers/91555-why-am-i-getting-an-error-9-after-manually-activating-a-windows-machine-with-a-disk-serial-number-t ; or wrong disk serial number for polyspace https://www.mathworks.com/matlabcentral/answers/93587-why-do-i-receive-a-license-error-9-when-using-a-polyspace-client-locked-to-the-computer-s-hard-driv; or R2008a Active Directory and username case sensitivity https://www.mathworks.com/matlabcentral/answers/93146-why-do-i-receive-a-license-manager-error-9-in-matlab-r2008a-after-changing-network-connections-on-w; or running R12 with old dongle https://www.mathworks.com/matlabcentral/answers/97510-why-do-i-receive-license-manager-error-9-when-i-run-matlab-6-0-r12-with-a-dongle
• error -9,57: username mismatch https://www.mathworks.com/matlabcentral/answers/99067-why-do-i-receive-license-manager-error-9
• error -10: license (possibly trial) expired https://www.mathworks.com/matlabcentral/answers/93260-why-do-i-receive-license-manager-error-10
• error -11: misformatted expiry date https://www.mathworks.com/matlabcentral/answers/94755-why-do-i-receive-license-manager-error-11
• error -12: problems communicating with license server https://www.mathworks.com/matlabcentral/answers/98736-why-do-i-receive-license-manager-error-12
• error -13: missing SERVER or DAEMON lines in license file https://www.mathworks.com/matlabcentral/answers/100538-why-do-i-receive-license-manager-error-13
• error -14: server name listed on client must be same as what the server knows itself as https://www.mathworks.com/matlabcentral/answers/96049-why-do-i-receive-license-manager-error-14
• error -15: attempt to borrow license over remote network timed out https://www.mathworks.com/matlabcentral/answers/97930-why-do-i-receive-a-license-manager-error-15-when-trying-to-checkout-a-license-key-from-a-distant-lo ; or log says MLM exited 255: conflict WMI vs MLM https://www.mathworks.com/matlabcentral/answers/126051-why-do-i-get-an-license-manager-error-15-on-my-windows-os-server-and-my-server-log-file-states-that
• error -15,10: license server not running or cannot be reached https://www.mathworks.com/matlabcentral/answers/98092-why-do-i-receive-license-manager-error-15; or MLM problem communicating with lmgrd https://www.mathworks.com/matlabcentral/answers/222781-why-do-i-get-an-exiting-due-to-signal-39-error-when-trying-to-start-my-license-manager
• error -15,570: problem reaching license server due to port problem or security software https://www.mathworks.com/matlabcentral/answers/91576-why-do-i-receive-flexlm-error-15-570-system-error-10038-winsock-specified-socket-is-invalid-w
• error -16: wrong path to MLM in your license file https://www.mathworks.com/matlabcentral/answers/93627-why-do-i-receive-license-manager-error-16; or ran out of file descriptors on Solaris 9 https://www.mathworks.com/matlabcentral/answers/99367-why-am-i-receiving-license-manager-error-16-when-starting-flexlm-8-0d-on-a-solaris-9-machine;
• error -16,287: path to MLM too long in R2009a https://www.mathworks.com/matlabcentral/answers/100367-why-do-i-receive-a-license-manager-error-16-when-my-directory-for-flexnet-is-very-long
• error -17: port conflict or license manager needs update https://www.mathworks.com/matlabcentral/answers/93789-why-do-i-receive-a-flexnet-licensing-error-17-xx-system-error-10054-winsock-connection-reset
• error -17,13: problem with license file or communicating with server https://www.mathworks.com/matlabcentral/answers/93815-why-do-i-receive-a-flexlm-error-17-xxx-system-error-10038-winsock-specified-socket-is-inva
• error -18: restart your license manager after updating license https://www.mathworks.com/matlabcentral/answers/106124-why-do-i-receive-license-manager-error-18; or DAEMON line is wrong, or quorum problems https://www.mathworks.com/matlabcentral/answers/349491-why-do-i-receive-mlm-not-master-server-checkout-attempt-of-matlab-from-user-host-refused-in-t
• error -21: you need a newer license file for this MATLAB release https://www.mathworks.com/matlabcentral/answers/100851-why-do-i-receive-license-manager-error-21
• error -25: you need a newer license file to support new license feature https://www.mathworks.com/matlabcentral/answers/95993-why-do-i-receive-license-manager-error-25
• error -29: no hardwired ethernet on Mac https://www.mathworks.com/matlabcentral/answers/184573-why-do-i-receive-a-flexnet-error-29-cannot-find-ethernet-device-when-trying-to-start-matlab
• error -31: current date is before date MATLAB was installed https://www.mathworks.com/matlabcentral/answers/91897-why-do-i-receive-license-manager-error-31
• error -33: network connection interrupted https://www.mathworks.com/matlabcentral/answers/94342-why-do-i-receive-license-manager-error-33
• error -34: system clock or timezone problem https://www.mathworks.com/matlabcentral/answers/94898-why-do-i-receive-license-manager-error-34 or https://www.mathworks.com/matlabcentral/answers/94745-why-do-i-receive-license-manager-error-34-when-i-start-matlab
• error -37: port number mismatch between client and server, you might be running multiple flexlm servers https://www.mathworks.com/matlabcentral/answers/98698-why-do-i-receive-license-manager-error-37
• error -38: you have been deliberately excluded from the license https://www.mathworks.com/matlabcentral/answers/102446-why-do-i-receive-license-manager-error-38
• error -39: you or your host are not listed in a group license https://www.mathworks.com/matlabcentral/answers/98895-why-do-i-receive-license-manager-error-39 ; or flexlm bug with INCLUDE_BORROW https://www.mathworks.com/matlabcentral/answers/93927-why-does-include_borrow-cause-error-39-with-specifed-features or you have installed product that you are not licensed for https://www.mathworks.com/matlabcentral/answers/695580-license-checkout-failed-user-host-not-on-include-list-for-neural_network_toolbox
• error -42,298 https://www.mathworks.com/matlabcentral/answers/245417-license-manager-error-42 "invalid parameter" (possibly host ID inconsistency)
• error -59: license port number already in use https://www.mathworks.com/matlabcentral/answers/92542-why-do-i-get-license-manager-error-59-when-starting-the-license-manager
• error -63: permissions issue returning borrowed license https://www.mathworks.com/matlabcentral/answers/96938-why-do-i-receive-a-license-administrator-63-error-when-trying-to-return-a-borrowed-license-key
• error -67: all keys are busy or reserved for lowwater https://www.mathworks.com/matlabcentral/answers/280252-why-do-i-receive-license-manager-error-67
• error -68: license borrowing is not enabled https://www.mathworks.com/matlabcentral/answers/279245-why-do-i-receive-license-manager-error-68
• error -83: update license file on server or update flexlm https://www.mathworks.com/matlabcentral/answers/92385-why-do-i-receive-license-manager-error-83
• error -84: user based license but no users listed https://www.mathworks.com/matlabcentral/answers/95191-why-do-i-receive-license-manager-error-84
• error -87: all licenses are checked out https://www.mathworks.com/matlabcentral/answers/97179-why-do-i-receive-license-manager-error-87 or flexlm bug affecting Simulink for R13 https://www.mathworks.com/matlabcentral/answers/95309-why-do-i-get-license-manager-error-87-when-i-try-open-a-second-model-in-simulink
• error -88: your clock is set wrong https://www.mathworks.com/matlabcentral/answers/97478-why-do-i-receive-license-manager-error-88
• error -89: license file is for different OS https://www.mathworks.com/matlabcentral/answers/95756-why-do-i-get-license-manager-error-89
• error -90: license file format problem https://www.mathworks.com/matlabcentral/answers/99834-why-do-i-receive-the-error-license-manager-error-90
• error -92: problem with license file on server https://www.mathworks.com/matlabcentral/answers/96724-why-am-i-receiving-license-manager-error-92
• error -95: license server cannot be resolved at license server;https://www.mathworks.com/matlabcentral/answers/95791-why-do-i-receive-license-manager-error-95; dynamic hostname problems on old OS-X versions https://www.mathworks.com/matlabcentral/answers/94341-why-do-i-receive-errors-when-i-try-to-start-either-matlab-or-the-network-license-manager-on-my-mac-o
• error -96: license server cannot be resolved at client https://www.mathworks.com/matlabcentral/answers/95122-why-do-i-receive-license-manager-error-96
• error -97: MLM failed to start because ports https://www.mathworks.com/matlabcentral/answers/97558-why-do-i-receive-license-manager-error-97; C: drive required to run license server on Windows https://www.mathworks.com/matlabcentral/answers/92414-why-did-i-receive-the-error-can-t-make-directory-c-flexlm-in-my-flexlm-log-file
• error -100: use different method of returning borrowed license https://www.mathworks.com/matlabcentral/answers/99240-why-do-i-receive-the-error-cannot-remove-a-linger-license-100-398-when-i-use-the-lmremove-comma
• error -101: you do not have a reservation for a product https://www.mathworks.com/matlabcentral/answers/101652-why-do-i-receive-license-manager-error-101
• error -103: you cannot always run MATLAB through Remote Desktop https://www.mathworks.com/matlabcentral/answers/91874-why-do-i-receive-license-manager-error-103; or you need at least R2007a for Windows Vista https://www.mathworks.com/matlabcentral/answers/97123-why-do-i-receive-a-license-manager-error-103-when-running-matlab-6-5-r13-on-windows-vista-or-wind
• error -104: license borrowed for too long; https://www.mathworks.com/matlabcentral/answers/106148-why-do-i-receive-license-manager-error-104
• error -114: license file needs newer license manager https://web.archive.org/web/20170110102956/https://www.mathworks.com/matlabcentral/answers/103563-why-do-i-receive-license-manager-error-114
• error -118: connection timed out, possibly firewall problems https://www.mathworks.com/matlabcentral/answers/609471-error-118-during-installation-of-matlab-r2020b-in-windows-computer-is-connected-to-the-internet
• error -139: communications timeout, try restricting your wildcards https://www.mathworks.com/matlabcentral/answers/126853-why-do-i-receive-license-manager-error-139
• error -140: license file needs newer license manager https://www.mathworks.com/matlabcentral/answers/330007-why-do-i-receive-license-manager-error-140-when-trying-to-start-matlab
• error -194: not enough license left for you to check license out https://www.mathworks.com/matlabcentral/answers/127046-why-do-i-get-a-license-manager-error-194-when-i-start-matlab
• error -361: license file is for newer version than your license https://www.mathworks.com/matlabcentral/answers/92071-why-do-i-get-activation-error-361-when-performing-a-license-update-within-matlab
• error -400: trial license expired but is still in your path https://www.mathworks.com/matlabcentral/answers/153559-why-do-i-receive-license-manager-error-400
• error -1302: license file is invalid for R2011a https://www.mathworks.com/matlabcentral/answers/102285-why-do-i-receive-error-1302-invalid-license-number-found-when-starting-my-r2011a-license-manager

There are also some other numbered conditions with slightly different origins

• error -1: PLP misentered or for wrong version https://www.mathworks.com/matlabcentral/answers/94774-why-do-i-receive-an-error-1-after-entering-my-plp-during-a-windows-installation-of-matlab
• error 1,1731: this license needs Mathworks Hosted License Manager (MHLM) https://www.mathworks.com/matlabcentral/answers/195328-why-do-i-receive-error-1-731-when-activating-mdcs-products, also observed with some trial licenses that included MDCS https://www.mathworks.com/matlabcentral/answers/140155-why-do-i-receive-error-1731-during-activation
• error 2: you tried to return a borrowed license but you have a license configuration problem https://www.mathworks.com/matlabcentral/answers/389303-why-do-i-get-error-2-when-returning-a-borrowed-license
• error 2,008: R2013a DVD key expired, use R2014a installer https://www.mathworks.com/matlabcentral/answers/121590-why-do-i-receive-the-error-2-008-license-not-active-or-not-found-when-activating-my-copy-of-matlab
• error 5,011: trying to install with wrong architecture files https://www.mathworks.com/matlabcentral/answers/125469-why-do-i-receive-error-5-011-when-clicking-next-after-selecting-my-license-number-in-the-matlab-inst
• error 16: problems contacting license server for MDCS https://www.mathworks.com/matlabcentral/answers/106144-why-do-i-receive-error-code-16-when-i-try-to-start-matlab-production-server-mps-using-mps-start
• error 24: ran out of file descriptors https://www.mathworks.com/matlabcentral/answers/306879-why-does-the-license-manager-failt-to-start-with-the-errno-24-in-the-logfile
• MLM signal 27: license file wrapped wrong https://www.mathworks.com/matlabcentral/answers/98645-why-does-the-license-manager-log-file-state-mlm-exiting-due-to-signal-27-after-starting-the-lice
• status 37: MLM problem resolving hostname https://www.mathworks.com/matlabcentral/answers/99185-why-do-i-receive-a-vendor-daemon-died-with-status-37-error-message-in-my-debug-log-file-when-tryin
• MLM signal 39: MLM problem communicating with lmgrd https://www.mathworks.com/matlabcentral/answers/222781-why-do-i-get-an-exiting-due-to-signal-39-error-when-trying-to-start-my-license-manager
• MLM status 52: unicode encoding problem https://www.mathworks.com/matlabcentral/answers/91393-why-does-the-license-manager-report-mlm-exited-with-status-52-no-license-file-with-the-polyspace-l
• error 201 when updating MATLAB: file is locked by another program https://www.mathworks.com/matlabcentral/answers/1899890-why-do-i-get-an-unable-to-continue-error-201-when-updating-matlab
• MLM status 241: tcp port wrong in license file https://www.mathworks.com/matlabcentral/answers/96143-why-does-the-error-vendor-daemon-died-with-status-241-appear-in-the-lmdebug-file
• Polyspace error code 241: is really -15 cannot connect to license server https://www.mathworks.com/matlabcentral/answers/102806-why-does-my-verification-stop-with-the-message-failure-with-error-code-241
• MLM status 255: conflict WMI vs MLM https://www.mathworks.com/matlabcentral/answers/126051-why-do-i-get-an-license-manager-error-15-on-my-windows-os-server-and-my-server-log-file-states-that
• error 334: you tried to create a profile for an email address that already exists https://www.mathworks.com/matlabcentral/answers/93320-why-do-i-get-a-service-error-error-334-an-attempt-to-create-a-new-profile-for-an-email-address-alr
• error 337: problem processing the activation https://www.mathworks.com/matlabcentral/answers/93689-why-do-i-get-the-error-337-the-information-you-provided-could-not-be-processed-please-check-your
• error 339 Your Mathworks Account Login session has expired: unknown cause, https://www.mathworks.com/matlabcentral/answers/2043847-why-i-got-error-339-while-trying-to-install-package-signal-processing-toolbox
• error 353: you have activated on the maximum number of systems permitted for that license type https://www.mathworks.com/matlabcentral/answers/92674-why-do-i-receive-error-353-or-error-1616-no-more-activations-available-when-attempting-to-activate
• activation error 340: change your MATLAB Central account type from Student to Academic https://www.mathworks.com/matlabcentral/answers/96683-why-do-i-receive-an-activation-error-340-or-983-when-activating-my-academic-license
• error 345: activation key is no longer valid https://www.mathworks.com/matlabcentral/answers/98193-why-do-i-get-error-345-when-trying-to-activate-my-matlab-license
• error 347: this kind of license needs user to have Mathworks account https://www.mathworks.com/matlabcentral/answers/95135-why-do-i-receive-an-error-347-when-activating-my-license; see https://www.mathworks.com/help/install/ug/how-can-i-activate-without-a-mathworks-account.html
• error 348: conflict over who will use license https://www.mathworks.com/matlabcentral/answers/97775-why-do-i-get-activation-error-348-when-logged-in-as-a-license-administrator and https://www.mathworks.com/matlabcentral/answers/95794-why-do-i-receive-an-error-348-when-attempting-to-activate-my-matlab-license
• error 353: you license admin activated this license https://www.mathworks.com/matlabcentral/answers/95521-why-do-i-get-activation-error-353-when-there-are-no-activations-listed-in-the-license-center
• error 354: you tried to move your license to a different host too many times this year https://www.mathworks.com/matlabcentral/answers/99612-why-do-i-receive-an-error-354-when-activating-my-license
• error 358: license has expired (while trying to activate) https://www.mathworks.com/matlabcentral/answers/101914-why-do-i-get-an-error-358-when-attempting-to-activate-matlab
• error 361: license file is for newer version than your license https://www.mathworks.com/matlabcentral/answers/92071-why-do-i-get-activation-error-361-when-performing-a-license-update-within-matlab
• error 375: proxy problems? https://www.mathworks.com/matlabcentral/answers/466842-problem-in-launching-matlab-error-code-375
• error 379: you are probably trying to enter Activation Key in File Installation Key field or other way around https://www.mathworks.com/matlabcentral/answers/196997-why-do-i-receive-an-error-510-when-installing-or-error-7000-or-error-379-when-activating-matlab
• error 400: you are not authorized to use this on-demand license https://www.mathworks.com/matlabcentral/answers/279690-why-do-i-receive-a-licensing-error-400-when-using-my-mdcs-on-demand-license; or your trial license was not properly converted when you purchased https://www.mathworks.com/matlabcentral/answers/153559-why-do-i-receive-license-manager-error-400
• error 510: you are probably trying to enter Activation Key in File Installation Key field or other way around https://www.mathworks.com/matlabcentral/answers/196997-why-do-i-receive-an-error-510-when-installing-or-error-7000-or-error-379-when-activating-matlab
• error 624: reactivate instead of Update license https://www.mathworks.com/matlabcentral/answers/101950-why-do-i-get-error-624-when-trying-to-update-my-license-through-matlab
• error 655: bug related to switching from Designated Computer to Named User https://www.mathworks.com/matlabcentral/answers/235075-why-do-i-receive-an-error-655-when-activating-matlab
• error 668: you tried to move your license to a different username too many times this year https://www.mathworks.com/matlabcentral/answers/100275-why-am-i-getting-an-error-668-maximum-number-of-licensed-end-user-redesignations-during-activatio
• error 676: you have so many licenses you need to use Activation Key instead of activation client https://www.mathworks.com/matlabcentral/answers/102858-why-do-i-receive-an-error-676-when-activating-matlab
• error 697: you gave the wrong Mathworks password https://www.mathworks.com/matlabcentral/answers/94165-why-do-i-get-error-1001-or-error-697-when-installing-or-activating-matlab
• error 956: you tried to activate a network license on a client https://www.mathworks.com/matlabcentral/answers/93733-why-do-i-receive-an-error-956-when-trying-to-activate
• activation error 983: change your MATLAB Central account type from Student to Academic https://www.mathworks.com/matlabcentral/answers/96683-why-do-i-receive-an-activation-error-340-or-983-when-activating-my-academic-license
• error -1001: you gave the wrong Mathworks password https://www.mathworks.com/matlabcentral/answers/94165-why-do-i-get-error-1001-or-error-697-when-installing-or-activating-matlab
• error 1616: you have activated on the maximum number of systems permitted for that license type https://www.mathworks.com/matlabcentral/answers/92674-why-do-i-receive-error-353-or-error-1616-no-more-activations-available-when-attempting-to-activate
• error 1731: this license needs Mathworks Hosted License Manager (MHLM) https://www.mathworks.com/matlabcentral/answers/195328-why-do-i-receive-error-1-731-when-activating-mdcs-products, also observed with some trial licenses that included MDCS or trying to activate a license that does not use activation https://www.mathworks.com/matlabcentral/answers/140155-why-do-i-receive-error-1731-during-activation
• error 1800, 1801, 1802, 1803, 1804, 1805, 1811: connection errors https://www.mathworks.com/matlabcentral/answers/92634-why-do-i-get-a-connection-error-when-installing-or-activating-matlab-or-other-mathworks-products
• error 2002: you are trying to activate MATLAB on too many systems https://www.mathworks.com/matlabcentral/answers/106133-why-do-i-receive-error-2002-the-serial-number-you-entered-cannot-be-activated-after-entering-my
• error 2006: you are trying to activate MATLAB on too many systems https://www.mathworks.com/matlabcentral/answers/110846-why-do-i-receive-error-2006-maximum-number-of-activations-exceeded-when-attempting-to-activate-ma
• error 4301: MATLAB was unable to install the MathWorks Service Host https://www.mathworks.com/matlabcentral/answers/2173200-why-do-i-receive-error-4301-error-initializing-licensing-could-not-start-mathworks-service-host
• error 4401: MCDS communications error or firewall problem https://www.mathworks.com/matlabcentral/answers/264358-why-do-i-receive-license-error-4401-when-validating-my-mdcs-cluster
• error 4402: connection error reaching Mathworks hosted license https://www.mathworks.com/matlabcentral/answers/279686-why-do-i-receive-license-manager-error-4402-when-launching-matlab-using-a-login-named-user-license
• error 5016: bug installing license when SMS expired, fixed R2011a https://www.mathworks.com/matlabcentral/answers/100128-why-do-i-receive-an-error-5016-when-installing-matlab
• error 5202: incompatible MacOS version, or need to restart Service Host, or antivirus problems https://www.mathworks.com/matlabcentral/answers/1815390-why-do-i-receive-error-5202-unable-to-access-services-required-to-run-matlab
• error 7000: you are probably trying to enter Activation Key in File Installation Key field or other way around https://www.mathworks.com/matlabcentral/answers/196997-why-do-i-receive-an-error-510-when-installing-or-error-7000-or-error-379-when-activating-matlab

Miscellaneous

• MATLAB cannot verify your license rights over the Internet https://www.mathworks.com/matlabcentral/answers/195430-why-do-i-see-the-error-matlab-cannot-verify-your-license-rights-over-the-internet-when-launching-m
• on monitoring license usage: https://www.mathworks.com/matlabcentral/answers/102546-how-do-i-monitor-the-usage-of-license-keys-for-matlab-and-toolboxes
• Application error The instruction at 0x78011f41 referenced memory at 0x000622d4: license manager DNS problems for R12 and R13 https://www.mathworks.com/matlabcentral/answers/94313-why-do-i-receive-an-application-error-when-starting-matlab-on-my-win-2000-machine
• Prevent users from running the license manager utilities: https://www.mathworks.com/matlabcentral/answers/94180-how-do-i-prevent-users-from-running-lmdown-lmremove-or-lmreread-from-a-client-machine
• Host ID shows up as 000000000000 on Linux: https://www.mathworks.com/matlabcentral/answers/100235-why-can-t-i-activate-matlab-or-start-the-network-license-manager-in-a-newer-linux-environment
• license manager will not start on Suse 9.3 due to case sensitivity: https://www.mathworks.com/matlabcentral/answers/93767-why-does-the-network-license-manager-not-start-at-boot-time-on-my-suse-9-3-linux-machine
• /sys/os/glnxa64/libstdc++.so.6: file too short: https://www.mathworks.com/matlabcentral/answers/301508-why-do-i-get-the-error-mlm-error-while-loading-shared-libraries-sys-os-glnxa64-libstdc-so-6-f
• Incorrectly built binary which accesses errno, h_errno or_res directly: https://www.mathworks.com/matlabcentral/answers/102247-why-do-i-receive-an-error-message-about-an-incorrectly-built-binary-on-my-linux-system-when-starting

[Jan]

+1. Thanks, Walter.

[Ed Callway]

Great FAQ, thanx! License borrowing always works fine, but the return date shown in the dialog is often a week or two before the current date. On 2022b, but had same issue with older versions. Some of my PCs show the correct return date, some always show an earlier date, all are Win 10 Pro or Enterprise, all up to date. Not a showstopper, but to someone who likes math, vaguely confusing. Confused date example:

[Rik]

Isn't that the date the previous user returned it?

[Ed Callway]

If so I'll ignore it - date previous license returned is not useful information.

"Return Date" to me means "the date this borrow will end".

Again on some machines it does that, on others it doesn't. Something random in some SW somewhere.

[Onyinye]

Please how can i resolve error 671 on MATLAB Licensing?

[Walter Roberson]

Unfortunately I have not seen this error before, so I do not know what the causes are.