F5 LTM upload a file issue

[Adolfo]

Hello,

I'm pretty new with F5 and I'm changing an old F5 for a new one, all seems to be good, I can access to all websites and applications, but in a website there is a pop-up window that allows to upload files, I can select the file then clicked in upload but it didn't work, the pop-up windows does not show any error message and in the F5 I can't find anything relate to this in ltm logs, the file is just not uploaded. I tried to talk with dev team to ask about the communication process, but it looks like they even don't know, so, I want to know if you have any recommendation regarding in how to do the troubleshooting in here?

I'll appreciate all your recommendations. Regards

[Daniel_Wolf]

Hi Adolfo,

there are a couple of ways to troubleshoot this issue:

1. Try with a different browser ( I guess you did that already).
2. Open the developer tools of your preferred browser (F12 or from the menu) - look for messages that could explain this behaviour.
3. Try a tcpdump on the BIG-IP, look if you can identify an issue there.

If you are new to packet capturing, I will recommend you the following resources

• K411: Overview of packet tracing with the tcpdump utility
• K2289: Using advanced tcpdump filters
• K1893: Packet trace analysis
• In case your application is using TLS: K31793632: Create a Decrypted Capture Without Using an iRule
• and in general: Chris Greer's YouTube channel

KR

Daniel