It could be php.ini configuration problems on the host if you already ruled out the plugins. Where are you hosting the site? Also, what was the exact error you received?
I wrote an article going through the troubleshooting steps of some of the errors I received when trying to install Jetpack myself. Maybe it will be of use to you: http://www.gordowebdesign.com/wordpress-troubleshooting-jetpack-failed-connection-curl-error-28-operation-timed-out-after-1000-milliseconds-with-0-bytes-received-solved/
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This reply was modified 9 years, 6 months ago by
aromasko. Reason: typo and adding link
Can you please use Jetpack’s Debugger module to send us some more information about your site?
- Go to the Jetpack page in your dashboard.
- Click on the Debug link appearing at the bottom of the page.
- Click the link that says “click here to contact Jetpack support.”
- Fill in the description box and your name and email address.
- Click the “Contact Support” button to send us the debug results privately. It’s best not to post this information on public forums, as it contains private details about your site.
Thanks!