Forum Discussion

SuperiorShorts's avatar
SuperiorShorts
Copper Contributor
Dec 04, 2025

Unusual behaviour on my PC. Access to all Microsoft services blocked.

One Drive does not connect. Microsoft.com loads on Chrome & Firefox but the link to the Microsoft account login page is dead. Outlook.com does not load at all. Connect to VPN (same country) and access to all Microsoft services reappears. Disconnect from VPN, connect to mobile hotspot (different ISP) and problem appears again. Reinstalled windows and problem persists. Wiped HDD and installed Linux and the unusual behaviour continues on Firefox and Chromium. Weird! All other devices on broadband and mobile internet are behaving normally. Any ideas? Curse? Nation-State?

admin

2 Replies

  • NikolinoDE's avatar
    NikolinoDE
    Platinum Contributor
    Dec 16, 2025

    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)

    1. Microsoft IP reputation block (false positive)
    2. IPv6 routing / filtering issue
    3. ASN / carrier-level filtering
    4. 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.

    Was the answer useful? Mark as best response and like it!

    This will help all forum participants.

    • SuperiorShorts's avatar
      SuperiorShorts
      Copper Contributor
      Dec 16, 2025

      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!

Resources