BloggingStudio

did you try to change some code in your theme’s functions.php file? if yes, please do following:
connect to your web host using ftp client (like filezilla) and navigate to your websites installation folder -> wp-content -> themes. If you have the original theme files, then I would suggest upload it(replacing old files).

usually web hosts already have periodic backups – may be weekly.
but first make sure that the plugins are really deleted or not. download a ftp client like filezilla (free) and use it to navigate to your websites installation folder -> wp-content -> plugins
you would need your ftp id and password that your host provided you.

It got resolved now. I am documenting it for others’ benefit plus my future reference.

ok here is what I did.

1. Disconnected Jetpack and tried to reconnect — Didn’t work. Was not able to connect at all.

2. Disabled all caching, Deactivated W3TC and tried to reconnect Jetpack. — Didn’t work.

3. Optimize and Repair Database – Didn’t work.

4. Reset .htaccess file contents. – Worked!!!

Didn’t waste time chasing my hosting provider (it was mentioned on some other threads). I have other blogs on same hosting account and it’s working fine.

So follow these steps:
1. take full backup of your website (Files as well as DB).

2. Disable W3TC, if you use it.

3. Rename your .htaccess file to htaccess_backup or something else. Caution – Your pretty permalinks will stop working.

4. Create a new .htaccess file using the default contents from below link:
https://codex.www.ads-software.com/htaccess

5. Connect Jetpack to WordPress.com

6. Restore .htaccess from backup.

7. Enable W3TC if you use it.

Since I started this thread and problem is resolved, I will close this thread.

No i didn’t. I have removed the connection and not posting automatically.
Let me try it again and will get back if it works.
I think it’s something to do with either W3TC or the CDN.