Last Modified: Nov 07, 2023
Known Affected Versions:
184.108.40.206, 220.127.116.11, 18.104.22.168, 22.214.171.124, 126.96.36.199
17.1.1, 16.1.4, 15.1.10
Opened: Mar 10, 2023 Severity: 3-Major
The 504 Gateway Timeout pool member responses are generated from a Microsoft webserver handling HTTP/2 requests. The tcpdump shows that the HTTP/2 stream sends the request without an appropriate End Stream flag on the Headers packet.
The HTTP GET request causing timeout.
The server has to provide settings with max-frame-size small enough to force BIG-IP to split the headers across multiple HTTP/2 frames, otherwise this issue does not occur.