how to examine the network issue

[lina <lina.lastname@gmail.com>]

Hi,

I found I can ssh to server,

but could not open some webpage. but can open google on and off. is it weird?

The connection was reset


          The connection to the server was reset while the page was loading.





  The site could be temporarily unavailable or too busy. Try again in a few
    moments.
  If you are unable to load any pages, check your computer's network
    connection.
  If your computer or network is protected by a firewall or proxy, make sure
    that Iceweasel is permitted to access the Web.