Issues with MS apps utilising network after 24H2 on Win11

Question

On my Windows Pro 11, running office 2019 (perpetual licence) I installed 24H2 on 16/1/25. On 17/1 outlook stopped updating mails on the pc from two servers (MS exchange and yahoo) via either wifi router or a mobile hotspot with AV running or disabled. Outlook system tray diag suggested unable to get server settings for encrypted connection. After signifcant troubleshooting contacted MS support, who were unable to resolve except to suggest deleting registry keys in case of corrupted profile. Due to risk to machine decided not do that and continue with New outlook which works (after a fashion). I should say outlook works with no issue on an Android device. Since then further issues have occurred with MS Teams app now not working though eventually browser version was made to work. Fnally Copilot standalone app now displays a white blank screen though appears to function inside Edge. Of course I have removed, reinstalled, 'repaired' and made as many other checks as I can think of or find.

With outlook 2019,after removing and resintalling I can no longer add a new profile since settings cannot be obtained, whether manually or in auto mode. This applies whether I try to add my MS (Exchange) account or a yahoo (IMAP) account. So server side issues are not the problem I believe.

It seems to me that the issue is a) with the installation on the PC and b) with security settings for links to some MS services. Because of the issues with Teams and Copilot I'm less inclined now to allow messing with the outlook registry keys. The prior update of 24H2 might be coincidental as may the SCEP Certificate enrollment initialization errors that I notice occur on bootup - at least since 20th since I only have 7 days of system logs. I suspect all of these issues are related.

Any ideas - other than the nuclear options (windows reinstall)). .

***moved from Outlook / Windows / Classic Outlook for Windows / For business***

Answer 1

Dear JohnPhix

Thank you for posting in the Microsoft community.

Although your problem is very complicated, it should be related to the fact that your current network is unable to connect to the Microsoft server through encryption, so it is not recommended that you reinstall Windows, you can refer to the following network troubleshooting program to solve this problem step by step

Setting up the security protocol

1. Click windows+R and type inetcpl.cpl to open the Internet options.
2. Click Advanced and check “Use SSL 3.0”, “Use TLS 1.0”, “Use TLS 1.1”, “Use TLS 1.2 Use TLS 1.3”.
3. Reboot the computer after application to see if the problem can be solved.

Changing DNS

1. Click windows+R and type ncpa.cpl.
2. Click the name of the network you are currently connected to, open the network status window, click Properties, and double click Internet Protocol version 4 (TCP/IPv4) in the network properties window.
3. Manually set the DNS server to “4.2.2.1” and “4.2.2.2”, and restart the computer to see if the problem can be solved.

Reset the network

1. Search for CMD, open it and find the command prompt (, run it in administrator) mode.
2. In the command box that pops up, enter the following commands (enter the next one after each line has finished running)

ipconfig /release

ipconfig /renew

ipconfig /flushdns

ipconfig /registerdns

netsh int ip reset

netsh winsock reset

netsh winhttp reset proxy

3. Restart the computer to see if the problem can be solved.

Reset Proxy Server Settings

1. Click windows+R and type inetcpl.cpl
2. Open the Internet option, click Connect, click LAN Settings.
3. Check whether the Proxy Server column is checked, if so, uncheck it and click OK.
4. Reboot your computer to see if the problem can be solved.

Open Network and Sharing Center:

Right-click the network icon on the taskbar and select “Open Network and Internet Settings”.

In the settings window, select “Network and Sharing Center”.

Change the adapter settings:

In the left menu, click “Change Adapter Settings”.

Select the network adapter:

Locate the network adapter you are using (e.g., Wi-Fi or Ethernet), right-click it and select Properties.

Uncheck IPv6:

Disable the three-way firewall or VPN proxy program.

Press WIN+X to go to Device Manager>Network Adapters>Check to see if there is a virtual network card VPN program like Kaspersky VPN. Try right-clicking to uninstall them.Uninstall third-party antivirus software, such as AVAST, NORTON, Kaspersky, ESET.

Disclaimer: Follow these steps to temporarily turn off real-time Microsoft Defender antivirus protection in Windows Security. However, keep in mind that if you do so, your device may be vulnerable to threats. So please turn on it immediately once issue fixed.

Best Wish

Shawn.Z-MSFT | Microsoft Community Support Specialist

Answer 2

AntiVirus Program, in my case Kaspersky Internet Security. Although KIS was up to date, it was necessary to switch to the newer Kasperksy Standard. In order to confirm it was KIS just pausing it seems to have been insufficient and it may have required either having MS Defender running for a while or possibly the network reset as suggested by Shawn Z (particulalrly the winsock reset).So I recommend to disable anti virus temporarily, ensure MS defender is running, reboot, disable AV again if necessary, reset the network as above, checking after *each* step whether communication is established. As I said, communications through web browser were not affected, nor was 'New Outlook'. Possibly it would hve affected any program using a specific protocol,not just MS apps.

Answer 3

I'm running Norton 360 so added ports 995 and 587 to as many in/ out programs and disable email scanning , that seems to work

Answer 4

This issue is resolved. It appears the security updates in 24H2 update and the (up to date) AVP blocked all services requiring specific protocols from running, including most MS services not runing in the browser. Pausing AVP alone seems have been insufficient to restore connectivity initially. Switched to a newer version of the AVP to fix.

I have same issues, how do i upgrade to a newer version of AVP ? What is AVP ?

Answer 5

This issue is resolved. It appears the security updates in 24H2 update and the (up to date) AVP blocked all services requiring specific protocols from running, including most MS services not runing in the browser. Pausing AVP alone seems have been insufficient to restore connectivity initially. Switched to a newer version of the AVP to fix.