The upgraded Symantec Endpoint Encryption 12.5.0 HF1 client is unable to check in to the server while the previous version continues to function correctly.
Error: Unable to connect to the server. Check your network connection
SEEM 11.3.0, 12.5.0 HF1
Value of SEEIdentity server web.config was NULL instead of 30
Navigate to the following directory on the SEE Management Server: C:\Program Files (x86)\Symantec\Symantec Endpoint Encryption Management Server\CommunicationWS\SEEIdentityServer
Locate and open the web.config file using a text editor (e.g., Notepad) with Administrator privileges.
Search for the following string: see: oauth:RefreshTokenExpiryPeriodDays
Locate the value="" attribute. If it is NULL or empty, update it to 30.
Corrected line: <add key="see:oauth:RefreshTokenExpiryPeriodDays" value="30" />
Save the changes to the file.