I have tried to mine when you have posted it and also got error for few sec and then when tried again all good, maybe it was NH problem for few min(it mines on NH EU server)?
Please tell me if this continues, also it should get back to your pool after the dev time over- right?.
I am also running the miner to check the log later to see if got same error.

Also why the ping is so High? can you give some info?

sry for the trouble.