Tip

Random Exchange client hang-up fix

 

Random Exchange client hang-up fix
Serdar Yegulalp

Users of Exchange Server have reported that sometimes Exchange clients will become unresponsive for minutes at a time. If this happens, chances are the RPC (Remote Procedure Call) service on your Exchange server may be overloaded. Since RPC deals with messages in a synchronous queue, slow clients may cause the RPC server to "hang" temporarily.

To get around this, increase the following registry entries to change the number of threads devoted to Exchange message processing.

HKEY_LOCAL_MACHINESystemCurrentControlSetServicesMSExchangeISParametersSystemMax Threads(Public+Private)

HKEY_LOCAL_MACHINESystemCurrentControlSetServicesMSExchangeISParametersSystemMinimum Threads

According to Microsoft, a maximum of 200 on a quad-processor system (and a minimum of 100) worked excellently. That works out to about 50 threads per processor, although with processors faster than 1.5 GHz you can probably get away with up to 100. Note also that jacking up the thread count too much will hang the server, so keep an eye out when you change these settings.

On a machine with more than 800 MB of RAM, make sure you have the latest Exchange Server service pack if you're using Exchange 5.5, or the machine will hang when it tries to allocate memory improperly.


Serdar Yegulalp is the editor of the

Requires Free Membership to View

Windows 2000 Power Users Newsletter.


This was first published in November 2001

There are Comments. Add yours.

 
TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to:

Disclaimer: Our Tips Exchange is a forum for you to share technical advice and expertise with your peers and to learn from other enterprise IT professionals. TechTarget provides the infrastructure to facilitate this sharing of information. However, we cannot guarantee the accuracy or validity of the material submitted. You agree that your use of the Ask The Expert services and your reliance on any questions, answers, information or other materials received through this Web site is at your own risk.