There was probably a problem with the litev7 devfee pool, and 177 is probably too rigorous regarding the devfee connections, i loosened that on later versions much..
I changed the litev7 devfee pools now maybe that helps, but you should ... move to a newer version, as i can't/won't do any support for those old versions.
Doing that at the moment, but problem persist on newer versions as well. I'm testing them on a couple of machines and problem with connections is happening on newer as well.
Beside, I've only got 15W less and no performance increase per machine with latest and 177 was far more stable.
Edit: I was testing them....not I'm testing them.
Latest version is connecting as we speak.