OpenVPN: can't connect to websites

Hy, I’m unable to visit any website after I’ve established a VPN connection with

sudo openvpn --config /paht/to/file.ovpn

If I try to ‘ping’ a website for example moodle.htw-aalen.de I get:

ping: moodle.htw-aalen.de: Temporary failure in name resolution

using a IP addr on the other hand is not a problem:

PING 141.18.30.168 (141.18.30.168) 56(84) bytes of data.
64 bytes from 141.18.30.168: icmp_seq=1 ttl=60 time=27.3 ms
64 bytes from 141.18.30.168: icmp_seq=2 ttl=60 time=29.0 ms
64 bytes from 141.18.30.168: icmp_seq=3 ttl=60 time=32.6 ms
64 bytes from 141.18.30.168: icmp_seq=4 ttl=60 time=23.8 ms

--- 141.18.30.168 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 5ms
rtt min/avg/max/mdev = 23.827/28.200/32.616/3.165 ms

PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=2 ttl=117 time=33.9 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=117 time=36.5 ms
64 bytes from 8.8.8.8: icmp_seq=4 ttl=117 time=35.0 ms

--- 8.8.8.8 ping statistics ---
4 packets transmitted, 3 received, 25% packet loss, time 12ms
rtt min/avg/max/mdev = 33.902/35.133/36.492/1.082 ms

Has someone a sugestion what might causes that problem and can give me a hint how to solve it ?
I’m thankful for any advice.

I’m running Parrot 4.5, x86-64bit

I installed Parrot from a USB stick ( live+installer iso )

no multiboot

Ok thanks :), seems as if the port was the culprit