Obviously something does not work correctly. Check your hosts for any older or wrong entry. Also, check DNS response for hostname, FQDN and IP on both server and client. That should give you cause of the error (always does).

sorry but it is everything ok, if I use the ping fqdn name it answers me him that I serve it as the server linux both that I serve it as networker

this in the linux server

[root@PP-MIVSERV01 etc]# nslookup 172.16.100.50
Server: 172.16.100.100
Address: 172.16.100.100#53

** server can't find 50.100.16.172.in-addr.arpa: NXDOMAIN

[root@PP-MIVSERV01 etc]# nslookup pp-mivserv01.peronipompe.local
Server: 172.16.100.100
Address: 172.16.100.100#53

Name: pp-mivserv01.peronipompe.local
Address: 172.16.100.50

Ping is irrelevant in this case. Use nslookup to verify name resolution. Do what I said and post the result here.

Looks like PTR record is missing (plus you didn't check hostname and you didn't do remaining tests on client).

OK... so pp-mivserv01=172.16.100.50

Now on that same host do:
- nslookup 172.16.100.50
- nslookup pp-mivserv01.peronipompe.local

That will probably work. Then you must go to backup server and do the same:
- nslookup 172.16.100.50
- nslookup pp-mivserv01
- nslookup pp-mivserv01.peronipompe.local

Chances are something will be wrong. While there, check hosts table on both nodes.

this is the networker server


Z:\>nslookup pp-mivserv01.peronipompe
Server: pp-midc01.peronipompe.local
Address: 172.16.100.100

*** pp-midc01.peronipompe.local can't find pp-mivserv01.peronipompe: Non-existent d

Z:\>nslookup 172.16.100.50
Server: pp-midc01.peronipompe.local
Address: 172.16.100.100

*** pp-midc01.peronipompe.local can't find 172.16.100.50: Non-existent domain

Z:\>nslookup pp-mivserv01
Server: pp-midc01.peronipompe.local
Address: 172.16.100.100

Name: pp-mivserv01.peronipompe.local

[root@PP-MIVSERV01 etc]# nslookup pp-mivserv01
Server: 172.16.100.100
Address: 172.16.100.100#53

Name: pp-mivserv01.peronipompe.local
Address: 172.16.100.50

server DNS is 172.16.100.100

Fix PTR records. As far as I see your first query was not correct as you missed .local

If mentioned error does not affect backups you may ignore it.