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Ken_B_50116's avatar
Ken_B_50116
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Oct 06, 2015

Browser error after returns to PC to save file

The web app is load balanced using LTM 11.4.1 HF9. SNAT is in use. In the web app, users choose reports to be run. Some reports take 30 or 45 minutes to be generated (this is expected), so the users will walk away from the PC and do something else. While the user is gone, the report will be generated and the browser will pop up a "save as" dialog box. When the user returns to the PC 30 or 60 minutes later and tries to save the file, IE shows a "page cannot be displayed" error. This does not happen when the user works directly with the web app server.

 

The LTM virtual server TCP timeout is 8 hours and uses source address persistence for 8 hours.

 

Are there any other settings I can check or change before getting packet captures in all 3 places to try to diagnose the problem?

 

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  • Ken_B_50116's avatar
    Ken_B_50116
    Icon for Cirrostratus rankCirrostratus
    Oct 08, 2015

    Here's the config for the virtual servers and profiles:

    [Active:Changes Pending] config  tmsh list /ltm virtual vs_EPSI

ltm virtual vs_EPSI {
    destination 10.15.112.68:80
    ip-protocol tcp
    mask 255.255.255.255
    persist {
        persist_EPSI {
            default yes
        }
    }
    pool pool_EPSI
    profiles {
        http_EPSI { }
        tcp_EPSI { }
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    vs-index 87
}
    [Active:Changes Pending] config  tmsh list /ltm profile http http_EPSI
ltm profile http http_EPSI {
    app-service none
    defaults-from http
    request-chunking rechunk
    response-chunking rechunk
}
[Active:Changes Pending] config  tmsh list /ltm profile tcp tcp_EPSI
ltm profile tcp tcp_EPSI {
    app-service none
    defaults-from tcp
    idle-timeout 28800
}

    [Active:Changes Pending] config  tmsh list /ltm persistence | grep -i EPSI -A4
ltm persistence source-addr persist_EPSI {
    app-service none
    defaults-from source_addr
    timeout 28800
  • Ken_B_50116's avatar
    Ken_B_50116
    Icon for Cirrostratus rankCirrostratus
    Oct 08, 2015

    I have learned that the three web app servers may not be configured identically. Apparently only one of the three servers is configured to serve reports, but it's not clear how a user on server1 gets a report from server3 (assuming server3 is the only one that can serve reports) I am not sure if this is contributing to the original problem. I'm having the users test against specific servers to see what happens.