After rc.newwanipv6 "503 Service unavailable"

[JasMan]

Hey,
Since I've configured IPv6 on my OPNsense 22.7.4, the web GUI is sometimes not available.
According to the logs this happens after the rc.newwanipv6 has run due to a connection change, and the lighthttpd is restarted (can't bind to socket: 127.0.0.1:443: Address already in use).

System.log

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<13>1 2022-09-17T09:05:34+02:00 FIREWALLNAME php 68729 - [meta sequenceId="45"] plugins_configure vpn (,wan)
<13>1 2022-09-17T09:05:34+02:00 FIREWALLNAME php 68729 - [meta sequenceId="46"] plugins_configure vpn (execute task : ipsec_configure_do(,wan))
<13>1 2022-09-17T09:05:34+02:00 FIREWALLNAME php 68729 - [meta sequenceId="47"] plugins_configure vpn (execute task : openvpn_configure_do(,wan))
<11>1 2022-09-17T09:05:34+02:00 FIREWALLNAME php 68729 - [meta sequenceId="48"] /usr/local/etc/rc.newwanipv6: Resyncing OpenVPN instances for interface WAN.
<13>1 2022-09-17T09:05:34+02:00 FIREWALLNAME php 68729 - [meta sequenceId="49"] plugins_configure newwanip (,wan)
<13>1 2022-09-17T09:05:34+02:00 FIREWALLNAME php 68729 - [meta sequenceId="50"] plugins_configure newwanip (execute task : dnsmasq_configure_do())
<13>1 2022-09-17T09:05:34+02:00 FIREWALLNAME php 68729 - [meta sequenceId="51"] plugins_configure newwanip (execute task : ntpd_configure_do())
<13>1 2022-09-17T09:05:34+02:00 FIREWALLNAME php 35924 - [meta sequenceId="52"] plugins_configure newwanip (execute task : opendns_configure_do())
<13>1 2022-09-17T09:05:34+02:00 FIREWALLNAME php 35924 - [meta sequenceId="53"] plugins_configure newwanip (execute task : openssh_configure_do(,wan))
<11>1 2022-09-17T09:05:34+02:00 FIREWALLNAME php 68729 - [meta sequenceId="54"] /usr/local/etc/rc.newwanipv6: The command '/usr/local/sbin/ntpd -g -c '/var/etc/ntpd.conf'' returned exit code '1', the output was ''
<13>1 2022-09-17T09:05:34+02:00 FIREWALLNAME php 68729 - [meta sequenceId="55"] plugins_configure newwanip (execute task : opendns_configure_do())
<13>1 2022-09-17T09:05:34+02:00 FIREWALLNAME php 68729 - [meta sequenceId="56"] plugins_configure newwanip (execute task : openssh_configure_do(,wan))
<13>1 2022-09-17T09:05:34+02:00 FIREWALLNAME php 68729 - [meta sequenceId="57"] plugins_configure newwanip (execute task : unbound_configure_do(,wan))
<13>1 2022-09-17T09:05:34+02:00 FIREWALLNAME php 35924 - [meta sequenceId="58"] plugins_configure newwanip (execute task : unbound_configure_do(,wan))
<13>1 2022-09-17T09:05:35+02:00 FIREWALLNAME php 68729 - [meta sequenceId="59"] plugins_configure newwanip (execute task : vxlan_configure_do())
<13>1 2022-09-17T09:05:35+02:00 FIREWALLNAME php 35924 - [meta sequenceId="60"] plugins_configure newwanip (execute task : vxlan_configure_do())
<13>1 2022-09-17T09:05:35+02:00 FIREWALLNAME php 68729 - [meta sequenceId="61"] plugins_configure newwanip (execute task : webgui_configure_do(,wan))
<13>1 2022-09-17T09:05:35+02:00 FIREWALLNAME php 35924 - [meta sequenceId="62"] plugins_configure newwanip (execute task : webgui_configure_do(,wan))
<11>1 2022-09-17T09:05:36+02:00 FIREWALLNAME php 35924 - [meta sequenceId="63"] /usr/local/etc/rc.newwanipv6: The command '/usr/local/sbin/lighttpd -f /var/etc/lighty-webConfigurator.conf' returned exit code '255', the output was '2022-09-17 09:05:36: (network.c.540) can't bind to socket: 127.0.0.1:443: Address already in use'
WebGUI log

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<27>1 2022-09-17T09:05:35+02:00 FIREWALLNAME lighttpd 67897 - [meta sequenceId="1"] (server.c.2097) server stopped by UID = 0 PID = 14049
<27>1 2022-09-17T09:05:36+02:00 FIREWALLNAME lighttpd 16538 - [meta sequenceId="2"] (server.c.1588) server started (lighttpd/1.4.66)
<27>1 2022-09-17T09:05:36+02:00 FIREWALLNAME lighttpd 16538 - [meta sequenceId="3"] (gw_backend.c.378) child signalled: 1
<27>1 2022-09-17T09:05:36+02:00 FIREWALLNAME lighttpd 16538 - [meta sequenceId="4"] (gw_backend.c.378) child signalled: 1
<27>1 2022-09-17T10:52:08+02:00 FIREWALLNAME lighttpd 16538 - [meta sequenceId="1"] (gw_backend.c.283) establishing connection failed: socket: unix:/tmp/php-fastcgi.socket-1: Connection refused
<27>1 2022-09-17T10:52:08+02:00 FIREWALLNAME lighttpd 16538 - [meta sequenceId="2"] (gw_backend.c.283) establishing connection failed: socket: unix:/tmp/php-fastcgi.socket-0: Connection refused
<27>1 2022-09-17T10:52:08+02:00 FIREWALLNAME lighttpd 16538 - [meta sequenceId="3"] (gw_backend.c.993) all handlers for /index.php? on .php are down.
A restart of the web GUI (/usr/local/etc/rc.restart_webgui) fails too. I've to kill and start the lighthttpd process to restore it.
The web GUI is configured to listen on two interfaces only. Any thoughts what could be the issue here?

Jas

[JasMan]

Seems that this was caused by a faulty patch cable. The WAN IF went up and down, and because of the frequency the lighttpd run into a failure.
I've replaced the cable and since one week no issues so far.