Forum Discussion

Copper Contributor

Dec 09, 2024

Security Admin Center Tenant Allow/Block List Not Able to Block IPv4?

While using the Security Admin Center Tenant Allow/Block List we have been able to block specific email addresses and IPv6 IP addresses but are unable to block IPv4 IP addresses. We have tried both u...

microsoft 365 defender

outlook

security

crangel

Copper Contributor

Jan 02, 2025

We have the same problem. Ay ideas on this??

chumphry
Copper Contributor
Apr 22, 2025
It appears that box only accepts IPv6, same with the command line version. I have no idea why Microsoft would configure it to only accept IPv6 and not IPv4.