Linux vacca.o2switch.net 4.18.0-553.123.2.lve.el8.x86_64 #1 SMP Thu May 7 23:17:13 UTC 2026 x86_64

//usr/lib/firewalld/services/dns-over-tls.xml

 <?xml version="1.0" encoding="utf-8"?>
<service>
  <short>DNS over TLS</short>
  <description>DNS over TLS (DoT) is a security protocol for encrypting and wrapping Domain Name System (DNS) queries and answers via the Transport Layer Security (TLS) protocol</description>
  <port protocol="tcp" port="853"/>
</service>