Symptoms

• After promoting backup Publishing Agent to the master role all RDSH (Terminal Server) and Gateway Agents are being shown as "Not verified" in RAS Console.
• However at the same time, the farm is functioning (e.g. users can connect and launch published applications)

• The are lot of errors in Publishing Agent log file:

  [E 00/00000073] Error in database Execute: 11 (DELETE FROM tbl_SessionCache WHERE s_SiteID = 1
  

• If you revert master role to previous Publishing Agent everything is going back to normal.

Cause

Licensing.db file corruption

Resolution

On the affected server, do the following:

1. Stop*RAS Redundancy* and RAS Publishing Agent services.
2. Rename (or delete) Licensing.db from C:\Program Files (x86)\Parallels\ApplicationServer\AppData
3. Start the services from step 1 back.
4. Initiate promotion to the Master role once again.