Forum Discussion
emile
Nimbostratus
NimbostratusPOST requests lost between two vs intermittently
Hi, Since we upgraded our BIG-IP F5 from 14.1.4.6 to 17.1.0.2, we encountered a loss of POST requests between virtualserver and our backend. This is always the same request which is blocked. Firs...
Hi emile,
Packet capture can help you troubleshoot the issue.
Starting from v16.1.0, a new feature available in the HTTP profile. Allow space title name feature, which is disabled by default, may be triggering this issue.
Allow Space Header Name: Specifies whether to allow white space in an HTTP header between the header name and the separator colon in an HTTP request or response. When Enabled, the BIG-IP system ignores white space between the header name and the colon. This feature is disabled by default.
https://my.f5.com/manage/s/article/K40243113
emileHi Enes,
Thanks a lot for your answer.
I've tried to pass the value of tmm.http.rfc.allowwsheadername to disable in v14.1.4.6 and I didn't manage to reproduce the issue.
To be sure, I'll enable the setting concerned in v17 and see if the problem disappears.- emile
Unfortunately, the problem persists with the Allow Space Header Name enabled.
- emile
We can confirm that the bug was introduced in v16, we upgraded to v15 and the bug disappeared. We looked for similar issues that appeared in v16 but didn't find anything conclusive. any help would be most welcome.