internet troubleshooting

 internet troubleshooting

I believe that every single of internet user have problem when they are trying to access internet. Some question that you ask when having Troubleshooting no Internet access or unable to access few websites are :

1.  Why is HTTP access to a particular site slow or failing? 
2. The WAN (Ethernet) Connection to the Internet (ISP) Seems Intermittent or Drops Completely Connection?
3. Network connectivity may fail when you try to use Windows Vista
4. Some Computers Behind the SonicWALL Cannot Connect to the Internet
5. Unable to access certain websites, either slow or completely failing

How you want to solve it. Lot of problem comes out .But, nothing you can do to overcome these problems. 

Tips of internet troubleshooting

Here I want to share tips when you are unable to access certain websites, either slow or completely failing.

1. Check MTU settings on the WAN interface(s).  An incorrect MTU is the most common cause of web   browsing issues.

2. Determine if Content Filter Service (CFS )is blocking the site in question due to policy.  Make sure that CFS is not being used. Ensure that the Security Services log category is configured for logging on the Log > Categories configuration screen . You must modify the categories or create a domain exclusion to allow the traffic.

3. Determine if CFS is blocking due to lack of host header in the first HTTP packet.  CFS checks the hostname listed in the HTTP Host header to determine the category of the site in question.  You must toggle the "Enforce Host Tag Search for CFS" setting on the diag.html page of the management GUI.  It is recommended that you contact SonicWALL Technical Support for assistance with this operation 

4. Check whether Enable HTTP Byte-Range requests with Gateway AV  the SonicWALL GAV by default  suppresses the use of HTTP Byte-Range requests to prevent the sectional retrieval and reassembly of the potentially malicious content. This is done by terminating the connection and thus preventing the user from receiving the malicious payload. By enabling this option you will override this setting.

Don’t forget to try this tip when you are unable to access the certain websites.