Hey guys,

I receive the above-mentioned error after installing Kolab on a fresh buster server, in accordance to the kolab online guide.
I fugured, that the problem is caused by the configuration during the kolab installation process.

For example:
netstat -tnlp | grep :143
shows a configuration only for tcp6. Tcp doesn’t even show up for the configuration process. The same is for all other ports except http and https.

I tried to globally deactivate ipv6 with the following commands:
nano /etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6=1

unfortunately no changes. Could anyone give me some support please.

Thanks in advanced for your support!

Best Regards
Arno