I am having problems mining using GPU.
I tried using claymore I get this error that says wallet is not supported and it cant connect to the pool
when I tried XMR-STAK-AMD It fails to connect to the pool : sumo.sumominer.com:4444

[2017-05-08 10:26:27] : Connecting to pool sumo.sumominer.com:4444 ...
[2017-05-08 10:26:48] : SOCKET ERROR - CONNECT error: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
[2017-05-08 10:26:48] : Pool connection lost. Waiting 10 s before retry (attempt 1).

what might be the cause of this problem ?