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After another unsuccessful attempt to clear Amdapoor with a party with 3 friends, I once again had the disconnection error at the second Ochu blocking the path. I Tried logging back in but got the error on the loading screen. If I didn't press Okay on the error message the game wouldn't close and to them it looked like I was still logged in.

So my friends went into the first boss and managed to 3 man him down. Once they killed him, I pressed confirm on the error and restarted the client. Then when I logged in I GOT IN. For reals. I was able to roll on loot and run around. I joined the rest of my group and completed the rest of the dungeon without any errors.

Whatever the error it, I am guessing it has something to do with the graphical display of the first boss, cause the error occurred around the time the game would start to render him in. With the boss dead, then there as nothing to display and the error went away. I have not tested it to see if I will still get the error on subsequent dungeon runs, but I think it is quite likely.

But YAY! Expert is finally unlocked. I hope this can help people also suffering from this issue, that if they can get a party of friend to 3 man the first boss you should be able to get a clear.