This feature in MBAM is without doubt the worst, I disabled it on both my MBAM Pro installation as it proves to be more hassle than it is worth. I have even seen it block avast IPs.

It would only have to be an image hosted on that IP, like an avatar for it to have a hissy fit.

To do any sort of investigation, you would have to start by posting the url of the avast topic you were trying to connect.