"- Here is a Mac OS X Server (really old, El Capitan 10.11.6, Server 5.2) with serveral services running (all the years)
- OPNsense 22.7.11 running unbound as DNS server
- Apple TimeCapsule running WiFi access
- iMac M1 OS X 12.6.3
Problem
OPNsense firewall is blocking traffic from iMac to Server over LAN/Ethernet suddenly. Not happening with connections from outside over WAN and connections over the local WiFi AP. AFP file sharing and VNC remote access are suffering. Calendar and addressbook services are not affected noticeably.
1st AFP and VNC connections establish fast. Browsing the servers directories is fast until the connection gets stucked and the iMac shows the rainbow spinning wheel. VNC is running well, looses connection and is reconnecting itself after some different length of timeout.
Looking the OPNsense firewall live log shows the same (see attachments): 1st connection, some time running well, then suddenly blocking by Default deny / state violation rule. Waiting some time could establish a reconnection if my iMac is not freezing himself meanwhile in the save-as dialog of an open document.
Until now
This setup has been running over years with the last changes to the firewall maybe 20 month back. Updating OPNsense and Mac OS regularly. Absolutely no troubles before the OPNsense last main update and before the iMac's Mac OS 12.5/6.
Any idea, where I have to start fixing? Thanks in advance.
