Hello I have setup and running of the MN on a VPS.

I have the client running on my PC as well.
I have them both synced.

I have pressed start MN on my PC client.
In the VPS it gives stat that it is running, but I get watchdog_expired.

I look into sentinel log and it shows me this:

2018-02-15 12:33:01 [info]: SCHEMA_VERSION (code) = [20170111-1]
2018-02-15 12:33:01 [info]: DB_SCHEMA_VERSION = [20170111-1]
[Errno -2] Name or service not known
Cannot connect to terracoind. Please ensure terracoind is running and the JSONRPC port is open to Sentinel.


what can I do to fix it?
The terracoind is running all fine.
Do I need to ask my VPS provider to do something or do I have to do something in settings of the VPS?