Can't connect to TCP port 4949 on :: [Invalid argument] with default munin-node config "host *"

[Perdu]

Describe the bug
My munin-node.service started crashing even though I did not modify the config. The service crashes without displaying any relevant information, but munin-node.log contains:

2024/07/02-17:05:02 Munin::Node::Server (type Net::Server::Fork) starting! pid(739273)
Resolved [*]:4949 to [::]:4949, IPv6
Not including resolved host [0.0.0.0] IPv4 because it will be handled by [::] IPv6
Binding to TCP port 4949 on host :: with IPv6
2024/07/02-17:05:02 Can't connect to TCP port 4949 on :: [Invalid argument]
  at line 66 in file /usr/share/perl5/vendor_perl/Net/Server/Proto/TCP.pm
2024/07/02-17:05:02 Server closing!
shutdown() on unopened socket GEN0 at /usr/lib/perl5/5.38/core_perl/IO/Socket.pm line 327.

Following advices in #1579, I tried modifying the host line in munin-node.conf... And it works again. For some reason, the default host * crashes, but host 127.0.0.1 doesn't.

Desktop (please complete the following information):

• OS+Distribution Version: arch linux
• Munin Version: 2.0.76-1

[corbolais]

Same here.

# cat /etc/debian_version
trixie
# munin-node -V
Version:
This is munin-node v2.0.76

Fixed by using host 0.0.0.0 instead of host *.

thx

[s7m0n]

seeing the same here but apparently using

host *

is only an issue on boot. If i issue a service munin-node restart after boot it works.
Assumption: maybe ipv4 is ready at this time while ipv6 is not yet - and later both are ok.

[baszero]

I have this config and connections are denied, please help!

log_level 4
log_file /var/log/munin/munin-node.log
pid_file /var/run/munin/munin-node.pid

background 1
setsid 1

user root
group root
ignore_file [\#~]$
ignore_file DEADJOE$
ignore_file \.bak$
ignore_file %$
ignore_file \.dpkg-(tmp|new|old|dist)$
ignore_file \.rpm(save|new)$
ignore_file \.pod$

address 127.0.0.1
allow ^0\.0\.0\.0/0$

host 0.0.0.0
port 4949

log:
2024/08/12-14:38:45 [16544] Denying connection from: 81.6.44.61

i use version 2

[niclan]

Hi,

allow ^0.0.0.0/0$

allow does string matching. You need allow ^81\.6.\44\.61$. In the docs there is a mention about some module you need to install and then you can use allow_cidr to do network matching.