Problems communicating at Bitcoin RPC

[worldinacoin]

I keep getting the above error when mining at a certain pool, is there something I need to set at my side to avoid this error?

[RyNinDaCleM]

Make sure you typed the domain name properly, as well as the correct port.

You may need to forward the specific port in your firewall/router!

User:pass are entered exactly as you registered at the pool?

[worldinacoin]

I am using Windows 7, the user and password is correct as this happens only intermittent, what are the steps to forward the particular port?