I know this is an old Post, but I'm seeing the same happening even today in my Post here: File Transfers not working ... but here's a *New* clue! to the old problem.
It acts like a Users account gets banned, fire-walled or corrupted somehow?
And I mean within OpenFire as I am #gulp running without any firewalls just to negate me out of the issue.
All help or suggestions very welcome, thank you ...
