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pepeshark's avatar
Icon for Nimbostratus rankNimbostratus
Mar 05, 2024

stalled/blocked request



My short topology:

client browser->F5->IIS servers

I have a .Net web application. Randomly some request is in stalled/blocked state in browser. 

For example:

I can see a request that spend 7 minutes in stalled state and then it is processed less than 1 second.

I can't see high cpu, memory, connection load at this time. The peak connection is 4k, but I think it is not too high.

At same time I can see lot of success request also.

I think the request is waiting for something on my F5, but I don't know for what. Could anyone help me how can I detect the reason?

My opinion is that I reached the connection limit but I can see any error message in log about it. How can I check it?



3 Replies

  • if have not, enable Oneconnect in the virtual server config to reduce number of server side TCP connections.
    you can simply use the default Oneconnect profile.
    i have seen downtime in a big telco service provider was solved simply by enabling it.


    • pepeshark's avatar
      Icon for Nimbostratus rankNimbostratus

      Thanks for you idea. But it is already set up.


      • zamroni777's avatar
        Icon for Cumulonimbus rankCumulonimbus

        in that case, you should do tcpdump in f5 and also check the webserver.

        it is also possible that the webserver gets slow response from database servers, storage, etc.