Execution Time Error related to 'service: all' in Debian Bookworm and Bullseye

[qosobrin]

• OS: Debian Bookworm (12)
• Kernel: 6.1.0-18-amd64
• Firehol Version: 3.1.7+ds-2.1

I have recently updated one of my servers from Debian Bullseye to Bookworm, and upon review of the journal, an error related to the FireHOL service has been observed.

hostmaster@hostname:~$ journalctl  -b 0 -p err -u firehol.service
mar 06 12:18:53 hostname FireHOL[1345]: Runtime WARNING 'This might or might not affect the operation of your firewall.'.

Although the message indicates it is a warning, it is marked as an error by the OS. After thorough investigation, we have linked this error to the following line in the firehol.conf configuration file:

server4 all deny src "${listanegra}" LOG "listanegra"

Upon examination of another server still running Debian Bullseye (11) with the same configuration line, we discovered a similar error, albeit with a different error message:

mar 07 10:42:23 hostname FireHOL[797716]: Runtime ERROR '# 1.'. Source FIN

After debugging the FireHOL service using the set -v option, we found that the error occurs after attempting to load the module nf_conntrack_proto_gre as also documented in https://firehol.org/firehol-manual.html#service-all

mar 08 11:59:55 hostname firehol[407]: load_kernel_module nf_conntrack_proto_gre  >/dev/null 2>&1 || echo >/dev/null
mar 08 11:59:55 hostname FireHOL[1531]: Runtime WARNING 'This might or might not affect the operation of your firewall.'. Source FIN

I believe this is an error that should be addressed, as Netfilter Conntrack GRE is no longer a separate kernel module but is integrated into the kernel itself (torvalds/linux@22fc4c4)

Thank you very much in advance.
Best regards.