Booted from server in the middle of a parse, after the server lagged and gave me a random loading screen.
Edit 1 (I'm assuming this will happen more than twice): Once again, same character, same place, same error message.
Edit 2 (anyone surprised?): can't log in, get the same message, repeatedly.
Info: Not on Steam, don't run ESO through Steam, nor did I buy it through Steam.
Edit 3: I got back to my original destination, finally. Thanks ESO, for actually letting me port to my friend's house, without booting me from the server.
I got this error while learning hoarded motif chapters on an alt account. Realized I had a bunch saved up that didn't require Rank 10 in a crafting passive so figured I'd free up some bank space that way. Guess I'll have to give it a few minutes and try again later.
Since this thread is over one year old now, we've decided to close the discussion. The help article linked below has details on what Error 307 means when attempting to login. You are welcome to start a new discussion about this particular issue. You can also contact customer support for assistance.