EWBF, Error: Stratum authorization timeout


I just started to get the following error in my ewbf zcash miner:
Error Stratum authorization timeout.

I switched between the “stratum+tcp://zec-eu.suprnova” and the normal “stratum+tcp://zec.suprnova” pool but i still get this error. I didnt change anything in my settings, why does the authorization not work anymore?