Sounds like a DNS problem on your PVE or network. Can you perform DNS lookups on your PVE?
OK thanks for the reply. The network is seems working. I run several VMs on this proxmox and they all have good internet connection. I can ping 1.1.1.1 or traceroute from proxmox shell and it shows results. I am on proxmox 6.33 version as I see in GUI.
traceroute to 1.1.1.1 (1.1.1.1), 30 hops max, 60 byte packets
1 192.168.2.1 (192.168.2.1) 0.218 ms 0.237 ms 0.289 ms
^C
root@V1:~# ping shop.maurer-it.com:443
ping: shop.maurer-it.com:443: Name or service not known
root@V1:~# ping shop.maurer-it.com
ping: shop.maurer-it.com: Temporary failure in name resolution
root@V1:~# ping 1.1.1.1
PING 1.1.1.1 (1.1.1.1) 56(84) bytes of data.
64 bytes from 1.1.1.1: icmp_seq=1 ttl=56 time=12.4 ms
64 bytes from 1.1.1.1: icmp_seq=2 ttl=56 time=12.9 ms
64 bytes from 1.1.1.1: icmp_seq=3 ttl=56 time=15.1 ms
^C
--- 1.1.1.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 6ms
rtt min/avg/max/mdev = 12.357/13.451/15.115/1.195 ms
