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Available Worker Threads = 0

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Available Worker Threads = 0 - 25.Nov.2010 11:02:08 PM   


Posts: 5
Joined: 15.Mar.2010
Status: offline

I am intermittently seeing the Performance Counter of ISA Server Firewall Service --> Available Worker Threads = 0.

When this happens, web clients Internet surfing slows to crawl. Everything from DNS resolution to RDP sessions slow to a crawl as well.

I have verified that CPU utilization remains below 5%, Page Faults are lows, network utilization is low, Pending DNS resolution counters are 0, Pending TCP connection counters are 0, Disk I/O is low. I cannot find anything wrong with the box. The network team has looked at the switch ports connecting to these ISA servers and there are no errors there either.

Can anyone tell me how to investigate the causes of "Available Worker Threads" going down to 0 on an ISA server? I'm out of ideas.

Post #: 1
RE: Available Worker Threads = 0 - 24.Jun.2013 11:16:05 AM   


Posts: 107
Joined: 8.Aug.2007
Status: offline

Did you by chance have HTTPS Inspection enabled? If so, did you by chance have CRL checking enabled?

Basically, when your available worker threads goes to zero, TMG is unable to do anything until available worker threads is above zero.

This can happen when your array is too busy. CRL checking in a busy array can do this.

(in reply to anon76)
Post #: 2

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