Hey @jitendrakashyap!
I know it's a long shot, but have you also cleared the cache of the default web browser on your computer?
Could you temporarily disable any antivirus or firewalls you may have running on your computer and try again?
Since you mentioned that the app is also facing issues, would you mind clarifying the app's current syncing status and version that you're using, please? Feel free to let me know if you get any errors when using the app too.