Timeout accessing Webmin on hostname:10000 but IP works

SYSTEM INFORMATION
OS type and version Debian 11 Linux 5.10.0-21-amd64
Webmin version 2.013

It’s an internal domain. DNS A record is present.
lsof -i -n -P
miniserv. 741 root 5u IPv4 13522 0t0 TCP :10000 (LISTEN)
miniserv. 741 root 6u IPv4 13523 0t0 UDP :10000

Other internal servers are working fine, but I can’t find the cause of this. I only found that in Self-Signed SSL Certificate > Certificate tab there’s an IP and on other servers there is domain name.

/etc/hosts has IP, domain name, hostname (same as other servers). Firewall on Debian is disabled.

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