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Server to busy warning while servers arent't busy at all...

Last week we updated our (cluster) hosting environment to Windows Server 2012 and IIS8. Since the update we experiencing some ‘server to busy’ warnings on aspx sites (asp.net).

We have multiple load balances (hardware) webservers with 24GB memory and XEON processors each. De servers are not (physical) busy at all during the warnings... All the servers in our cluster are not using more then 10GB physical memory.

Here’s what we figured out so far. When we set the “Virtual Memory Limit” to zero in the “Application Pool Defaults”, the servers will work for a couple of minutes. But after some minutes, suddenly all (or some) asp.net websites are giving a “server to busy” warning. When we refresh the sites, sometimes they work and sometimes they don’t.

We are now using  the following “Application Pool Defaults” to let the asp.net sites work. However, some asp.net sites are not working properly with these settings at all.

Private Memory Limit: 100mb
Virtual Memory Limit: 100mb

Can someone tell us what we doing wrong? Why are the asp.net sites giving a “server to busy” warning while the servers aren’t busy at all?

Thanks in advance, if you need any more information about settings etc please let us know.


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