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jsgibbs1's avatar
jsgibbs1
Icon for Nimbostratus rankNimbostratus
Feb 19, 2016

Troubleshoot LTM file upload

I need assistance troubleshooting an LTM file upload problem:

 

A web server allows browser based file uploads. However, when I move the server behind the LTM, the files are not passed. I don't see anything in the logs. I'm not running ASM or anything else that should be blocking/rejecting/stripping the files. I've never had an issue like this, so I'm not really sure where to begin. Appreciate any ideas.

 

  1. LTM v.11.3.x
  2. Standard Virtual Server using SSL termination (tried as Performance Layer 4 as well, no change)
  3. No iRules in place
  4. Test file is an blank .txt
file upload
LTM
  • IanB's avatar
    IanB
    Icon for Employee rankEmployee
    Feb 19, 2016
    How big is your test file ? Try creating a :80 (no ssl termination) virtual for testing purposes, with the same pool members, and tcpdump the stream to see what's going on. Try removing the HTTP profile from the virtual if you have one, to eliminate that. Check /var/log/ltm as you're testing.
  • tatmotiv's avatar
    tatmotiv
    Icon for Cirrostratus rankCirrostratus
    Feb 19, 2016
    "I don't see anything in the logs" means on the bigIP or on the webserver? If you see HTTP requests on the webserver, but the file upload does not finish, try deactivating nagle algorithm in the tcp profile if it is enabled. Had a similar issue a while ago. It turned out that nagle algorithm being activated in the tcp profile was the problem. The last portion of the file upload did never finish, because TCP was waiting for the last gap to be filled.
  • jsgibbs1's avatar
    jsgibbs1
    Icon for Nimbostratus rankNimbostratus
    Mar 30, 2016

    Fyi, This turned out to be an issue on the customer's server.