Can no longer log into central.sophos.com from Migration Tool.

Question

I'm in the middle of migrating all of our endpoints to Sophos Cloud using the Migration Tool with 1000+ machines left to migrate. Yesterday around 1pm EST I was kicked out of the tool and now it will no longer allow me to log in. What changed in yesterday's update to the website that is preventing login? I cannot get into the migration tool, or into the sophos cloud website. The server running SEC is 2003 R2 SP2 and we cannot seem to hit the website from any server running that flavor of OS now.

This thread was automatically locked due to age.

WomboCombo · Answer

For anyone else that has this issue follow the below to resolve this issue. This only applies to Server 2003 environments at this stage.

Apply all available recommended Windows Updates 
 Get the updated root certificate of GlobalSign by download and installing the R2 GlobalSign Root Certificate: https://support.globalsign.com/customer/portal/articles/1426602-globalsign-root-certificates Note: Thumbprint: 75:e0:ab:b6:13:85:12:27:1c:04:f8:5f:dd:de:38:e4:b7:24:2e:fe 
 Download the Microsoft SHA256 support hotfix https://support.microsoft.com/en-us/kb/938397 and install it. 
 Download the Microsoft AES support hotfix https://support.microsoft.com/en-gb/kb/948963 and install it. 
 If this still does not work, please visit https://support.globalsign.com/customer/portal/articles/1434478-update-globalsign-root-certificate---windows-xp-windows-2000 and follow the Manual fix directions (It does not state 2003, but it is impacted and the instructions are the same). 
 Visit https://www.digicert.com/digicert-root-certificates.htm and download and install the Digicert Assured ID Root CA as a Root Certification Authority.

Can no longer log into central.sophos.com from Migration Tool.

Submitted a Tech Support Case lately from the Support Portal?