How to enable websocket secure connection for f5 vip 14.1.2.8

You must have Allowed WebSocket URLs to your ASM policy. Your policy might not have these added automatically, especially if it came from an earlier version of ASM.

Navigate to the correct partition, and then: Security > Application Security > URLs > Allowed URLs > Allowed WebSocket URLs. Ensure you have the correct policy selected from the drop down, and that there are wildcard WS/WSS URLs (or more specific ones, if you want).

Without any Allowed WebSocket URLs, websockets will be blocked by ASM.