Why is my server using a well known port as source port

Is it normal that my server is requesting 8.8.8.8 dns with 22/udp as source port? How can i get it to use unregistered ports only

Solution 1:

Is it normal that my server is requesting dns with 22/udp as source port?

No.

You would expect DNS queries from a client to use either:

a random ephemeral port (which you can adjust in /proc/sys/net/ipv4/ip_local_port_range but is typically 32769-60999)
when no port randomization is used: UDP port 53