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"Invalid hostname" error ​

The actual error ​

If you see errors like

Invalid hostname error

or

Invalid hostname kick error

you are in the right place!

Checklist ​

1. Check the domain you join with ​

In this example we say that we want to join to our server using play.example.com. I set up a CNAME record on play.example.com correctly, the problem is that I forgot to add it to our domains tab in our panel.

2. I did not add both SRV and CNAME domains to our panel ​

If you have an SRV record pointing to another CNAME e.g. _minecraft._tcp.example.com (SRV) pointing to play.example.com (CNAME) you need to register both play.example.com and example.com in our panel.