[cups] (no subject)

I installed and configured CUPS on Rocky Linux 8.7
The server has two NICs; one for LAN (Internal) and one ofr WAN (pppoe,external)

The install includes the standard hplip-3.18.4-9.el8.x86_64 and the ppp.gz file from the latest hplip (3.22) as my printer in not included in 3.18
I can add the printer through CUPS admin webpage and also load the above mentioned ppd.gz file.
When I am trying to print a page I get the following messages:

	Feb 13 19:08:30 home cupsd[13138]: HP_ENVY_Pro_6400_series root 5 [13/Feb/2023:19:08:30 +0100] 1 1 - localhost Test Page - - Feb 13 19:08:30 home cupsd[13138]: HP_ENVY_Pro_6400_series root 5 [13/Feb/2023:19:08:30 +0100] 2 1 - localhost Test Page - - Feb 13 19:08:38 home cupsd[13138]: [Job 5] The printer may not exist or is unavailable at this time. Feb 13 19:08:41 home cupsd[13138]: [Job 5] The printer may not exist or is unavailable at this time. 

	I can access the HP_ENVY_Pro_6400_series printer admin page through my browser with its corresponding IP 10.5.2.10.
But but I cannot ping it.

	PING 10.5.2.10 (10.5.2.10) 56(84) bytes of data. From 10.5.2.1 icmp_seq=1 Destination Host Unreachable From 10.5.2.1 icmp_seq=2 Destination Host Unreachable From 10.5.2.1 icmp_seq=3 Destination Host Unreachable 
Firewall Port 631/tcp is open (internal zone) and listening:

	 netstat -tunlp | grep 631 tcp 0 0 0.0.0.0:631 0.0.0.0:* LISTEN 13138/cupsd tcp6 0 0 :::631 :::* LISTEN 13138/cupsd udp 0 0 0.0.0.0:631 0.0.0.0:* 13140/cups-browsed``` 
I'd appreciate if you could help me to debug the error

Best regards,

Wolfgang
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