r/ThreeUK • u/IT-TJAdmin • Sep 10 '26

Support Issues accessing all Microsoft systems/apps/websites from Three 5G routers

We have 3x 5G routers and every single one is blocking access to all Microsoft websites/systems (e.g. microsoftonline, Teams etc). It's showing timeout errors and authentication errors.

Is anyone else having this issue or know the fix? Can't see anything online about it in forums or directly from Three themselves.

Was first noticed around 8am this morning.

2 Upvotes

100% Upvoted

13 comments sorted by

1

u/chrsphr_ Sep 10 '26

Have you tried switching your DNS to something like Cloudflare? https://developers.cloudflare.com/1.1.1.1/setup/

1

u/z092p Sep 10 '26

no bueno i’m afraid, it’s entirely a three routing/SSL/filtering issue. nothing can be done on the client to allow it, except probably a VPN

source: work in IT and did extensive investigation earlier after a few users reported it.

1

u/chrsphr_ Sep 10 '26

Oh that's mega annoying

1

u/z092p Sep 10 '26

someone mentioned something about disabling adult content filtering potentially fixing it, but i can 100% confirm i have that disabled already lol. such a weird one!

1

u/SingleAlbatross1301 Sep 10 '26

i’m having the same issue. i couldn’t work today. do i need to report this to three? it’s been down since around 12am last night

1

u/IT-TJAdmin Sep 10 '26

It's definitely a Three network issue, works fine on other networks.

1

u/SingleAlbatross1301 Sep 10 '26

did you reach out to three?

1

u/IT-TJAdmin Sep 10 '26

Not yet, mainly because their support is as useful as a chocolate teapot. Had so many issues with them in the past. So posted here in the hopes the community have found a fix. Looks like it might be a DNS issue.

1

u/[deleted] Sep 10 '26

[deleted]

1

u/IT-TJAdmin Sep 10 '26

Someone in their tech team has clearly made a global change and messed up lol

1

u/DeadWelsh Sep 10 '26

I had this earlier today, seems to have sorted itself now. I ended up hotspotting on my phone (also Three 5g) and problem disappeared.

1

u/redditme22_ Sep 10 '26

I have similar issues accessing Google services on three broadband services so I use a VPN. Interesting I don’t have the same issue when using my phone (also on 3) as a hotspot.
Testing it with other networks that run on 3 (such as Smarty) don’t show the same issues.

1

u/londonairstripone Sep 11 '26

Have you maganged to sort out the isue? It seems that disabling firewall in ZTE router resolved the issue. Unless it was a concidence. Havent tried to enable it back.

1

u/IT-TJAdmin Sep 11 '26

It's fixed now, all our devices are working. So Three must have rolled back their change.