I'm trying to setup a DNS Slave server with DirectSlave. In the past I have done this with no issues at all. But for some reason when I add an IP to MultiServer with the credentials of the Slave I'm unable to login. When I change the credentials to the credentials of the Directadmin installation I get the response:
xxx.xxx.xxx.xxx DirectAdmin v1.53.0 connection OK

When I try to connect to an other installation of directadmin it does work.

So i've 2 slave DNS server who are both not working how can i solve this?