Some users can not access certain websites but other users can

Hello All

       I have a weird problem. Certain users can not access yahoo.com or sometimes google.com using Firefox or IE. On the affected laptop I can ping,traceroute,and nslookup to yahoo server without issues. I can log into the Windows domain controller server and pull up yahoo without problems. A certain user is having trouble sending email to yahoo using Outlook. DNS is properly resolving host names as far as I can tell. I tried bypassing the local DNS server and using an external server on the client machine without help. I also tried restarting the switch and Cisco ASA 5510 without avail.  I am going to use wireshark on the affected PC(s) to see if they are routing traffic and also capture traffic on the ASA. Is their something that I am missing? Any suggestions on how I should go about this problem?



greenbeanx81Asked:
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the_b1ackfoxCIOCommented:
so when you try to open a website using an ip address only do you still have the problem?
0
dnudelmanCommented:
Make sure all the internal computer have the main DNS to you internal DNS server, no external DNSs. Then make sure you r DNS servwer can foward DNS queries successfuly.
Looks like you have a  mix of DNS configu on client computers.
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pseudocyberCommented:
When you do your ping testing - try pinging with large packet sizes also - to verify there's not some MTU issue.

ping -l xxxx www.yahoo.com

ie:  

C:\Documents and Settings\x>ping -l 1458 yahoo.com

Pinging yahoo.com [66.94.234.13] with 1458 bytes of data:

Reply from 66.94.234.13: bytes=1458 time=69ms TTL=53

Ping statistics for 66.94.234.13:
    Packets: Sent = 1, Received = 1, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 69ms, Maximum = 69ms, Average = 69ms
Control-C
^C
C:\Documents and Settings\x>ping -l 1459 yahoo.com

Pinging yahoo.com [66.94.234.13] with 1459 bytes of data:

Request timed out.

Ping statistics for 66.94.234.13:
    Packets: Sent = 1, Received = 0, Lost = 1 (100% loss)
Control-C
^C
C:\Documents and Settings\x>
0

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greenbeanx81Author Commented:
The MTU was set at 1300 which was to low. Corrected the issue and everything appears fine. Thank you
0
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Network Analysis

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