Unable to login with some SSL enabled sites like gmail, yahoomail, etc

Unable to login with some SSL enabled sites like gmail, yahoomail, etc

1. First check whether the domain name is resolved to IP address using the DNS entered in your PC
    Open Command prompt  by typing Start > Run > cmd  

    C:> NSLOOKUP   gmail.com
    It should translates the domain name into IP address. If not, DNS entered is incorrect.

2.Wrong MTU setting might be the problem.( Need to change the MTU in CPE)
   For most cases  MTU setting of 1452 or 1492 is sufficient.
  
  To set the optimum value use the utility 
   MTUFINDER click download and save inside the windows folder.
   Open the command prompt
    Example command to get the MTU of a gmail website.
   c:> findmtu  gmail.com

Using Ping command to calculate the MTU size

A series of ping tests using the command,

ping www.expedient.net -f -l xxxx

where xxxx is the packet size, can be used to determine the optimal MTU for your connection.

1. Go to Start and select Run.

2. Type in cmd (Windows 2000/XP) or command (Windows 98/ME) into the Open: field.

Hit the enter key or click OK. The DOS prompt should open.

3. At the DOS prompt, type in ping www.expedient.net -f -l 1492 and hit the Enter key.

 4. Note the results above indicate that the packet needs to be fragmented. Lower the size the packet in increments of +/-10 (e.g. 1472, 1462, 1440, 1400) until you have a packet size that does not fragment.

5. Begin increasing the packet size from this number in small increments until you find the largest size that does not fragment. Add 28 to that number (IP/ICMP headers) to get the optimal MTU setting.
For example, if the largest packet size from ping tests is 1462, add 28 to 1462 to get a total of 1490 which is the optimal MTU setting

Posted in: Speed, Troubleshooting