backup job is failing with error 57 and 58

Can Anybody explain me the difference between error code 57 and  58.

As per my thinking most of the time issue is because of below reasone. Kinldy let me know any major difference when we will get error 57 and when we will get error 58.

Error code 57

client services are running or not 

port on client is in listining state

check the netbackup clinet service have admin rights

connectivity to bpcd

port configuration on both side client and server

Error code 58

can't connect to client

server is not able to connect

or bpcd port on client is not on listining state and name resulation issue