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"Wanna" ransomware outbreak. Please see this Sophos article for advice on how to protect your organization. Immediate action recommended.

Is anyone else seeing issues with proxy authentication and SMB v1 disabled on servers?

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.