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Limited functionality is available due to outage.

Error Message: Limited functionality is available due to outage.
Problem Statement:
Limited functionality is available due to backend server is not available or failed to connect backend server. User will don’t see presence information or they unable to login on Lync due backend server unavailability. This because of transaction log for the user services database reaches maximum capacity or SQL backend server down. You may see below error on Front End server if database reaches maximum capacity.
 Warning Event ID: 57005
The RtcDb Sync Agent failed to complete a push cycle: Identifier: []
Warning Event ID: 57006
Back-end Database: rtcxds  Sql native error: 9002   Connection string of:

driver={SQL Server Native Client 11.0};Trusted_Connection=yes;AutoTranslate=no;;;database=rtcxds;

Cause: Possible issues with back-end database. 

Error event ID: 30962 – If you see this event means you will be able to start Front Service on FE server.

Connection to back-end database succeeded, but failed to execute registration stored procedure on the back-end.  This error should not occur under normal operating conditions.  Contact product support. 

If you check backend server then you will below event
Error Event ID: 9002
Transaction log for database 'rtcsdx' is full due to 'LOG_BACKUP'.
In order to resolve this issue you need to make sure the back-end is functioning correctly.
You can run the DBCC SQLPERF (LOGSPACE) query to check the size and current capacity of all transaction logs on the back-end server.
You can truncate the transaction logs that reach maximum capacity by performing a SQL Server backup on them. This reduces the file size of the transaction logs.
Once SQL backup complete, you can see event ID 57001 logged on FE.
On SQL server you will see event ID: 18265. 

Thank you.


  1. Hi, Could you please let me know how to truncate the logs file.


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