Googlebot can’t access my site. Please help

[vishalesskay]

My site in webmaster tools showing certain errors due to which the Googlebot can't access my site 24x7pills.com. The errors showing 404 response Code on two urls while crawling and DNS error. Please help me to how to remove these errors from the site so that Googlebot could access the site.

[SeoDezin]

Please check either URL is already penalized or not. This has happened with one of my site

[pathannishat]

404 errors caused to broken links of your website and DNS errors may comes from your website hosting. So you need to check your website hosting and website pages which is hosted on server, that's why Google Webmaster Tools shows this errors.

[jannatul18]

Have you submitted the right URL to Google Webmaster tool? Please also recheck the robot.txt file properly, try to find out that you have not restricted your website URL there.