IPFire DNS Server not working for another IPFire over TLS

Hello,
Any reason why this setup fails - checking DNS Server status I get Error in WUI?
Internet <-> IPFIRE1 DNS Server <-> …DNS over TLS…<->IPFIRE2 using IPFire1 as DNS Server

This one do work - WUI reports OK when checking DNS Server status
Internet <-> IPFIRE1 DNS Server <-> …DNS over UDP…<->IPFIRE2 using IPFire1 as DNS Server

Thank you,
H&M

Please post a screenshot of the Domain Name System WebGUI page.

Ipfire 1 DNS page

Ipfire 2 - using Ipfire 1 as DNS server, protocol UDP = OK

Ipfire 2 - using Ipfire 1 as DNS server, protocol TLS= Broken / Error

What is the error message if you place your mouse pointer over the word Error and wait a second or so?

can't connect to a.b.c.d@853(TCP);

Solved: Nobody listen on TCP 853 in Ipfire1 - it only listens TCP and UDP 53 … this explain…
Thanks

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