Can’t send IM to chat groups "A server error occurred, please contact your administrator"

“A server error occurred, please contact your administrator” message error on Skype for business client.

If you are trying to send a message to a chat group and get this message error: “A server error occurred, please contact your administrator” maybe it’s a SQL problem, to confirm this you can run the follow command in a Skype for business Front End server:

PS C:\> Get-CsUserPoolInfo UserAffected

You can see to which server is connected

PrimaryPoolPrimaryRegistrar


As well you can hold the Ctrl key and right click on the Skype for business icon in the task bar



And check “Skype for business server” field to get the server name.

Once you get the Skype for business server, Go to Event viewer and check the errors, you will find the error “LS User Store Sync Agent” with Event 57005

Error encountered pushing data to RtcXds Blob Store.

The transaction log for database ‘rtcxds’ is full due to ‘LOG_BACKUP’.

or Event 9002 “The transaction log for database ‘rtcxds’ is full due to ‘DATABASE_MIRRORING’.”


It means you need to back up the rtcxds database.

Go to your backend SQL server, right click on rtcxds database, all task. Backup.
In the Backup type choose Transaction Log.

Add a destination and click on OK button.

After back up the DB you will be able to send IM to the chat groups.
In addition you can run this line on SQL server query.

DBCC SQLPERF (LOGSPACE)

To get all DB’s information


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