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I upgraded to v18.105 on one of my problematic MX67W models and it didn't help with the wifi issue one bit. I did put an Omada WAP on it and it worked fine though.... On another site I'm rolling back to v16 tonight.
I'm wasting hours of my time trying to figure out why my clients are having wifi issues and now I find all these posts. They released 17.10.2 anyway..... Sigh. (MX64W: LAN is fine, wifi is trash.)
Here's what mine looks like. Make sure that you apply it to all sites if you are adding manually. I took the easy route and went to Security Center, it shows all sites and I just clicked on "Microsoft Windows IIS denial-of-service attempt" and clicke...