unable to connect server while using LAN

Question

I am unable to connect to server when using outlook 365 on an LAN connection, but on WiFi it is working perfectly

Answer 1

Hi,

Is there any VPN involved?

1. Open Internet Options.
2. Go to the Connections tab.
3. Click LAN settings.
4. Enable Automatically detect settings.
5. Click OK to save changes.
6. Close Outlook completely.
7. Restart Outlook and check if the issue is resolved.

I’m eager to hear back and work together to find a solution.

Answer 2

If you are unable to connect to the server while using Outlook 365 on a LAN connection but it works fine on WiFi, this issue may be related to the Network Interface Card (NIC) drivers or the IPv4 Checksum functionality. Here are some steps you can take to troubleshoot the problem:

1. Update Network Card Drivers: Ensure that your network card drivers are up to date. Manufacturers frequently release updates to improve performance and fix compatibility issues. If there is no update available through Windows Update, visit the support or download section of your network card manufacturer's website.
2. Disable IPv4 Checksum Offload: This feature can sometimes cause connectivity issues. To disable it:
   • Open the Control Panel and go to View network connections.
   • Right-click on your network adapter and select Properties.
   • Click on Configure, then the Advanced tab.
   • Find IPv4 Checksum Offload, select it, and set it to Disable.
   • Click OK to save the changes.

After performing these steps, restart your computer and check if the issue persists.