Forum Discussion
Unusual behaviour on my PC. Access to all Microsoft services blocked.
What you’re describing is actually a classic network-level blocking / routing problem, and the clues you gave are very strong.
Most likely root causes (ranked)
- Microsoft IP reputation block (false positive)
- IPv6 routing / filtering issue
- ASN / carrier-level filtering
- Broken CGNAT routing
Best immediate workaround
Use a VPN
Or disable IPv6 if that fixes it
Proper fix
- Contact your ISP:
“My public IP is blocked by Microsoft identity endpoints. VPN fixes it.”
- Ask for:
New public IP
IPv4-only routing
Removal from CGNAT (if applicable)
My answers are voluntary and without guarantee!
Hope this will help you.
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Hi NikolinoDE Thank you for your help and comments. Turns out the problem was (mostly) caused by me. As one of my children was the main user of the PC, I had enabled basic Parental Controls on our TP-Link router. When I switched off the TP-Link "Chat & Messaging" web filter, the problem went away.
When I re-checked, there was no issue with the Wi-Fi hotspot; the issue was only on my home network.
So definitely not Microsoft's fault! I deservedly got a (very professional) "Oh my" from the Microsoft agent on live chat at one point, when I queried whether Microsoft might have blocked my device for some reason 🤣
Given that Microsoft login is required for one drive and account logins on Windows these days, I am surprised that TP-Link appear to have included Microsoft login pages in their "Chat & Messaging" blocks, but there you go, mystery solved!