Hi,

Apologies for posting here but there seems not to be a Skype Category.

I have the following Topology:

1.   A Central Site with a 3 member FE pool inplace upgraded from Lync 2013 Server

2.   An SBS server in a branch site.

The Topology publishes well and all services are starting successfully which shows that there are no server certificate issues.

But, users homed on the Branch Site never connects. The S4B client just sits with 'Contacting server and signing in...'

The errors that I get with the logging tools (Snooper) are:

1.   Start-Line: SIP/2.0 401 Unauthorized - Quite a few of these

2.   ms-diagnostics: 4172;reason="No cert found for the user";isauthoritative="false";source="SBS-Server.domain.local"

Furthermore I have this but I'm uncertain whether it is related to above:

TL_ERROR(TF_DIAG) [0]15F8.1554::06/19/2015-11:44:43.091.00000493 (SIPStack,SIPAdminLog::WriteDiagnosticEvent:SIPAdminLog.cpp(833))[0] $$begin_record
Severity: error
Text: Service is currently unavailable on all servers in a pool
Result-Code: 0xc3e93c79 SIPPROXY_E_DNSLB_SERVICE_DOWN_ON_ALL_SERVERS
Data: pool-size="3";pool="central-site.domain.local";port="5061"
$$end_record