Exchange packets through Netbios Port UDP 137
Issue:
We Spotted that, exchange server is trying to connect to MS Teams IP addresses on UDP 137the IPS are 52.123.134.179 - 52.123.135.179
Resolution :
first of All these IPS related to Microsoft Teams as per the link hereMicrosoft 365 URLs and IP address ranges - Microsoft 365 Enterprise | Microsoft Learn
we can say that it is not a normal behavior from Microsoft, but at least the environment is not compromised.
and to stop the unwanted connection we deactivated NetBIOS.
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