http_process_state_early_100continue error

This is the HTTP profile telling you that the server's response was invalid in some manner. To fix it, you need to fix the server, however, at a push you could likely work around it by disabling the HTTP profile in an iRule ( HTTP::disable ) for the problematic URL.

Are you using an iRule on that virtual to perform an HTTP::collect at all ? If you're doing that, and the client is setting an Expect: header indicating it expects an HTTP/100 continue response, then that combination will produce this error message (and reset the clientside and serverside connections)

If you don't have any irule magic going on, then I suggest you get a tcpdump capture of the issue, and open a support ticket to investigate further

Thanks Ian. There is indeed an HTTP::collect in the irule assigned to the VIP, but this is happening regardless of whether the client is sending the Expect: 100-continue header or not (I removed the header from the request, and it is still happening).

Also, I cannot remove the HTTP profile from this VIP - it is needed for an ASM policy.