Just sharing in case it helps. If you really did connect to the pool for 3 seconds then it’s likely not a username:pw issue but maybe this looks like your logs. https://bitcointalk.org/index.php?topic=5396806.0
Discussion
Awesome thanks! Just read through that. Two things I noticed were
“OS+ has fees in it and takes hashes to pay the fees, and thus you can't secure your miner behind a secure firewall, it must talk directly to slush no matter what you do.”
Have to confirm that’s not what’s messing me up.
I will also maybe try and reinstall the firmware ultimately that seemed to fix it for him. But yeah, weird, first time I plugged it in got a few TH/s for a few seconds with a green normal light before it wound down. Hm.
Thanks again for sharing the link!
