Over the last 24 hours, Googlebot encountered 195 errors while attempting to connect to your site. Your site's overall connection failure rate is 4.1%.
Verify that the web service software for your site is installed and running properly.
Verify that your firewall or server are not blocking googlebot's access to your site.
Verify that all scripts that run on your site have proper permissions to run.
Verify that your site has proper permissions to access the pages of your site.
Using Webmaster Tools, find a day with a high error rate and examine the logs for your web server for that day. Look for errors in the logs for that day and fix the causes of those errors.
Your site may be overloaded. Talk with your hosting provider about either reconfiguring your web server or allocating more resources to your web server.
If your site redirects to another hostname, another possible explanation is that a URL on your site is redirecting to a hostname that has one or more of the problems listed above.
After you think you've fixed the problem, use Fetch as Google to verify that Googlebot can properly access your site.
Any information will be helpful.
u see in the image Server Connectivity what error show