Oct 25 23:56:44 debian-13 systemd[1]: Starting abc.service - abc...
Oct 25 23:56:49 debian-13 systemd[1]: Started abc.service - abc.
Oct 25 23:56:51 debian-13 a.sh[3859]: Error: Failed to enable Split Tunnel: (exit status 4) Warning: Default IPv6 gateway is not defined.
Oct 25 23:56:51 debian-13 a.sh[3859]: Warning: Default IPv6 interface is not defined.
Oct 25 23:56:51 debian-13 a.sh[3859]: Warning: Extension MARK revision 0 not supported, missing kernel module?
Oct 25 23:56:51 debian-13 a.sh[3859]: ip6tables v1.8.10 (nf_tables): RULE_INSERT failed (No such file or directory): rule in chain IVPN_ST_OUTPUT
Oct 25 23:56:51 debian-13 systemd[1]: a.service: Main process exited, code=exited, status=1/FAILURE
Oct 25 23:56:51 debian-13 systemd[1]: a.service: Failed with result 'exit-code'.