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brahim94_11525's avatar
brahim94_11525
Icon for Nimbostratus rankNimbostratus
Apr 25, 2014

High RPC thread number on a CAS exchange server (v2010) after upgrading from v11.1 HF3 to v11.3 HF8

Hi,

 

After upgrading a VIPRION 2400 from v11.1 HF3 to v11.3 HF8. Outlook client suffers from many disconnection. After coming back to the version initial, this disconnection disappear.

 

On the CAS we have a RPC thread number increasing up to 500 after the upgrade. This causing disconnection on outlook clients. We see on tcpdump capture there has sometin RPC Fault with error code status equal to 1722 meaning "The RPC server is unavailable".

 

Is anyone encountered this kind of problem ?

 

Best regards,

 

application delivery
BIG-IP Access Policy Manager (APM)
deployment
LTM
microsoft
security
TMOS

2 Replies

  • TechNTactical_1's avatar
    TechNTactical_1
    Historic F5 Account
    Apr 25, 2014

    Are you using ASM to protect Exchange 2010?

     

    I know that RPC over HTTP in Exchange 2010 uses one huge HTTP request to carry all the client-server RPC traffic and similarly a huge HTTP response to carry all the server-client message traffic. Since ASM buffers each transaction it can't handle such traffic.