Hi  @Praveen_Kumar_9 

Thanks for posting here.

Here are some steps to troubleshoot and resolve the issue:

1. Restart the Omada Controller Service

2. Clear Browser Cache & Try a Different Browser

• Clear cache & cookies 
• Try Incognito/Private Mode 
• Test with a different browser 

3. Reinstall the Omada Controller

1. Uninstall the current version via Control Panel → Programs and Features.
2. Delete residual files (if any) from:

   C:\Users\<YourUser>\OmadaController
   

3. Download the latest version from TP-Link’s Omada Software Controller page.
4. Reinstall and try logging in again.

4. Check Firewall/Antivirus

• Temporarily disable Windows Defender Firewall or any third-party antivirus.
• Add exceptions for Omada Controller ports (8043, 8088, 29810-29817).

5. Contact TP-Link Support

If nothing helps, please contact TP-Link support for further help.