Hello. You didn't give enough information. Probably you submitted "bad" share and get banned. You will be automatically unbanned in a 30 mins. Please, give more information. What you got in the error log of your miner, which miner are you using, your miner config, etc.
I'm using XMR-stak
Sorry, this is the error
SOCKET ERROR - [168.235.86.33:4444] 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.