Why is " tcp_s is bad!!! Exiting" or "EXITING DUE TO SIGNAL 28 Exit reason 5" in my log file?

Why do I get the following entries in my log file?

ERROR: tcp_s is bad!!! Exiting 
EXITING DUE TO SIGNAL 28 Exit reason 5

Answer 1

[MathWorks Support Team]

This is an issue being investigated by MathWorks. To rule out a port related issue, you can set the port by adding the port=#### flag to the DAEMON line.

For example: 

DAEMON MLM "C:\Program Files\MATLAB\R20XXx\etc\win64\mlm.exe" port=27051

[Walter Roberson]

See https://www.mathworks.com/matlabcentral/answers/92581-can-the-network-license-manager-be-configured-to-work-inside-a-firewall

Answer 2

[Walter Roberson]

https://community.exchange.se.com/t5/Building-Automation-Knowledge/License-Administrator-error-quot-EXITING-DUE-TO-SIGNAL-28-Exit/ta-p/1497 and https://support.citrix.com/article/CTX132792 suggest that the problem can have several different causes:

• network interruption to license server
• anti-virus / firewall is blocking access to license server
• time between client and server is not synchronized to within two minutes

Restarting the server could potentially end up resynchronizing times, but if they later grow apart again, the problem could re-occur.