tvheadend plugin: refresh of EPG data throws error

[Norbert]

Hello all,
i use jellyfin 10.10.7 with the tvheadend plugin and connect to a current tvheadand instance.

When I try to refresh the EPG data jellyfin throw this error

Code:

[2025-05-14 09:46:03.665 +00:00] [ERR] [TVHclient] HTSConnectionAsync.open: exception caught
System.Net.Sockets.SocketException (00000005, 0xFFFDFFFF): Name or service not known
  at System.Net.Dns.GetHostEntryOrAddressesCore(String hostName, Boolean justAddresses, AddressFamily addressFamily, Nullable`1 startingTimestamp)
  at System.Net.Dns.GetHostEntry(String hostNameOrAddress, AddressFamily family)
  at TVHeadEnd.HTSP.HTSConnectionAsync.open(String hostname, Int32 port)

and repeats the message.

From the jellifin box I can ping the tvheadend box, both are in the same subnet.

The ports are open too:

Code:

root@media-server:~\ nmap -p 9981-9982 tvheadend.fm174.intern
Starting Nmap 7.93 ( https://nmap.org ) at 2025-05-14 11:43 UTC
Nmap scan report for tvheadend.fm174.intern (10.20.60.10)
Host is up (0.000028s latency).

PORT    STATE SERVICE
9981/tcp open  pumpkindb
9982/tcp open  unknown
MAC Address: 46:64:14:5A:3F:6B (Unknown)

Nmap done: 1 IP address (1 host up) scanned in 0.08 seconds

On the tvheadend side the server listens:

Code:

root@tv-server:/var/log\ ss -plantu | grep 998
tcp  LISTEN 0      511                0.0.0.0:9981              0.0.0.0:*    users:(("tvheadend",pid=1154397,fd=8))
tcp  LISTEN 0      511                0.0.0.0:9982              0.0.0.0:*    users:(("tvheadend",pid=1154397,fd=9))
tcp  ESTAB  0      0              10.20.60.10:9981          10.20.5.103:15068 users:(("tvheadend",pid=1154397,fd=42))

How can I investigate here further ?

Thanks a lot !

Norbert