CONFIG_LIVESTATUS_TCP_TLS changes from on to off, results in: Unhandled exception: 400: Site connection not initiated (EOF occurred in violation of protocol (_ssl.c:1129))

Troubleshooting
1

CMK version:
OMD - Open Monitoring Distribution Version 2.1.0p32.cee
OS version:
Rocky Linux release 8.9 (Green Obsidian)
Error message:
Unhandled exception: 400: Site connection not initiated (EOF occurred in violation of protocol (_ssl.c:1129)).
Output of “cmk --debug -vvn hostname”: (If it is a problem with checks or plugins)

We’re experiencing every so often this symptom: with CONFIG_LIVESTATUS_TCP_TLS=on, after applying pending changes the master site loses the connection to https://slave:6557 with the error above. To fix it the steps are:
omd stop && omd config set LIVESTATUS_TCP_TLS on && omd start
Until at some point in the future when it will happen again.
Any hints will be much appreciated, thanks.

2

Just an update, can it be selinux related? I’ve switched from enforcing to permissive, will keep an eye on it.