PAYG mobile broadband VPN to office only works on APN 3internet

[JimAitken]

I have a 4GLTE TPlink mobile broadband router with a PAYG sim which I connect to from a Windows laptop. All worked well except I couldn't connect to my office VPN. I changed the APN from three.co.uk to 3internet and the VPN now works perfectly.

The issue is that I also have a PAYG sim in my phone (APN three.co.uk)  and when I tether to it, all works well, apart from the VPN. I've tried setting up a new connection on the phone with the 3internet APN but I still can't connect to my office VPN.

Can anyone help?

Thanks
Jim

[Avondale · Accepted solution]

If you search for "VPN", without the quotation marks, on this forum, you will find other posts about this situation. I answered one last week. In summary, Three 5G home Broadband and VPNs sometimes work and sometimes they do not. I am fine with Cisco AnyConnect but others are not so lucky.