MasterServer connection issue.

This is very odd thing.
I’m using my own MasterServer for my online multiplayer game.
I’m getting “Failed to connect to master server at ServerAddress:ServerPort” constantly.
Odd thing is that sometimes it works normally and the players are connected.
Of course, it couldn’t much more.

I need the advice and helps from your Unity professionals!
Thanks,

can you ping the server itself ?

Of course, I can ping to the server itself.
I’m using the web service and masterserver at the same server.
I’m getting success when I log in to the web service but failure when I connect to the masterserver.
And this is sometimes rather than always.

Thanks,