All users cant get to some webpages

hi experts I have a strange problem where some websites are showing "page cant be displayed" in IE or "not available ERR_CONNECTION_TIMED_OUT" in Chrome. I have a sonicwall with content filtering and have added these pages to the whitelist to test. There is no sonicwall block page. Also we have ESET with web protection that I have temporarily disabled but still cannot get to these sites.

I have tested these sites on an outside line and mobile devices and they are fine. How can I go about troubleshooting an issue like this? I can ping by name and one example site is and I get replies from any workstation... but does not display in browsers. No proxy set in the browsers.

please advise,
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bbaoIT ConsultantCommented:
it seems like some kind of filter is in the middle.

are you able to try "TELNET 80" from command prompt on an internal computer?
WAMSINCAuthor Commented:
thats exactly what I thought. I have eset with some kind of web security feature but I disabled it. I have a sonicwall with content filtering but white listed the site. I can ping it but when I tried to telnet it didnt work as pasted below. Im out of ideas. There has to be a way to trace or sniff to see whats going on.

C:\Windows\system32>TELNET 80
Connecting To not open connection to the hos
, on port 80: Connect failed


Pinging [] with 32 bytes of data:
Reply from bytes=32 time=49ms TTL=55
Reply from bytes=32 time=70ms TTL=55
Reply from bytes=32 time=51ms TTL=55
Reply from bytes=32 time=49ms TTL=55

Ping statistics for
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 49ms, Maximum = 70ms, Average = 54ms

WAMSINCAuthor Commented:
so this turned out to be a bug in the way sonicwall handles frames [MTU] to some sites. Tweaking the MTU settings didnt help, but updating to the latest firmware fixed the problem

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WAMSINCAuthor Commented:
per sonicwall this was a known issue and updating the firmware fixed the problem.
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