[stateful inspection] suddenly obligated to set rule to "State Status: None"

[yjjoe]

Hi,
I don't know if it has occured because of an update, but I suddenly lost connectivity to all my servers. I can ping with success but when I try to access any web servers or idrac I'm blocked.
I've finally find a work around by going to advanced setting of my LAN firewall rule and set the "Sate Status" to None.
While if fixes my issues, but I'm still wondering what happened.

Any cues?