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Since installing the ms17-10 updates yesterday and disabling SMBv1 on domain controllers, I've got 3 customers now with proxy authentication issues. Seems to much of a coincidence for them to have problems at the same time and not have it related to the SMB protections against the WannaCry ransomware.
In reply to BAlfson:
The article only lists STAS as a solution for the XG series, as far as I understood STAS it should work for UTM, too, shouldn't it?