OpnSense blocks login.microsoftonline.com

[mvdheijkant]

I think this a a shot in the dark, but I think that my OPNSense is blocking login.microsoftonline.com
It's OPNSense or the way it is configured, because when I make a Wifi connection through a hotspot on my Phone, the signin validates immediately.
Also from another PC, I cannot Signin from Visual Studio, connected to my private network.
Through Fiddler I see that Visual Studio Signin goes to login.microsoftonline.com but doesn't return an answer.
I've disabled ClamAV (i think non related), Intrusion Detection, Unbound DNS (BlockList), without success.
But I still have no clou how I can see that the Visual Studio Signin passes or is blocked.

Is there a way to passthrough this url to see if it's caused by OPNSense. Or is there a good monitoring tool that can help me.

[EdwinKM]

It is your DNSBL probably. Beware: if your client is doing a dns lookup *BEFORE* you disable the DSNBL your client will cache the 0.0.0.0 IP.