Certain websites unreachable despite ok DNS, ping, etc.

[Guest]

Hi,

I'm at the end of my abilities to troubleshoot. I am unable to connect to
www.aopa org even though the rest of Internet seems reachable. I don't
understand what can cause this problem, here is what I have tried, to no
avail:

* Tried it on another network, still can't reach it
* Website is up and running, tried it from another computer, it works.
* Problem has persisted for 7 days now
* DNS lookup retrieves correct web address
* browsing to the website using the IP address doesn't work either
* Tracert to www.aopa.org works ok
* Telnet on port 80 connects fine, but no response from the server (same
issue, I suppose)
* Internet Explorer and also other browsers have the same issue
* Upgrading to IE7 didn't fix the issue (suspect it is not a browers issue,
but somewhere below the browers level)


Any suggestions what else I can try?

Thanks,

Ilan787

 

[hurajt]

Try changing MTU on your workstation or gateway to something lower. The
usual value is 1500 B and you can try to put it down to 1350 and if it
still doesn't work, down to 1100 or eve less. We had similar problem -
we guess it's caused by incorrent settings on our provider's side.
Probably WAN routers/switches can't cope with large packets ?

In Microsoft Windows 2000/XP change this registry value:
HKLM/System/CurrentControlSet/Services/Tcpip/Parameters/Interfaces/(TCPIP
stack of used connection)
The value doesn't exist as default - create it (DWORD MTU=1350(decimal)
See if it helps.

If anyone knows why this problem occurs, please let me know

sando

 

[Yves Leclerc]

You can try a different browse, which does not use any of IE files (like
FireFox.) If it still does not work, you would need to check your system for
some type of blocking software, such as anti-virus or anti-spyware blocking
tools. These may consider that site as a "bad" site.

There is always a possibility that some spyware/malware/hackware/trojan may be
on your system, which might block access to that site.

Lastly, you need to double check with your local Windows HOST file, which may
block access to that site also.

 

[Jon]

--
Jon

Necessity is the mother of invention

You can try a different browse, which does not use any of IE files (like
FireFox.) If it still does not work, you would need to check your system
for
some type of blocking software, such as anti-virus or anti-spyware
blocking
tools. These may consider that site as a "bad" site.

There is always a possibility that some spyware/malware/hackware/trojan
may be
on your system, which might block access to that site.

Lastly, you need to double check with your local Windows HOST file, which
may
block access to that site also.

Flushing the dns cache might resolve it (please forgive the pun)


( Start > Run > cmd > ipconfig /displaydns )
Start > Run > cmd > ipconfig /flushdns

Jon

 

[Guest]

Hi hurjat,

Thanks for your suggestion. I tried changing the MTU size, but the problem
persists. Any other theories?

Ilan787

 

[Guest]

Yves,

Thanks for your response. FireFox has the same issue and I checked my
anti-virus and anti-spyware blocking software. My other computer has the
same setup, so it is unlikely that the other computer would not be affected
the same way.

I also checked for hosts file hijacking, but I don't have a hosts file (I
have only a hosts.msn, but even that one has only the default loopback entry
int here).

Your suggestion of a trojan/malware/hackware is interesting, I hadn't
considered that. I'm not sure why someone would target aopa.org. However,
no trojan etc appears on my scans.

Any other ideas?

Thanks again for your help.

Ilan787

 

[Guest]

Jon,

Thanks for your post. I flushed the DNS as per your instructions, but
still experiencing the problem. Any other suggestions?

Thanks for your help.

Ilan787

 

[Guest]

Yves,

Thanks for your response. FireFox has the same issue and I checked my
anti-virus and anti-spyware blocking software. My other computer has the
same setup, so it is unlikely that the other computer would not be affected
the same way.

I also checked for hosts file hijacking, but I don't have a hosts file (I
have only a hosts.msn, but even that one has only the default loopback entry
int here).

Your suggestion of a trojan/malware/hackware is interesting, I hadn't
considered that. I'm not sure why someone would target aopa.org. However,
no trojan etc appears on my scans.

Any other ideas?

Thanks again for your help.

Ilan787

Hi Ilan,
A - Try to run these two commands and see what will come up:
1 = netsh winsock reset click [OK] and reboot your machine.
2 = sfc /scannow Click [OK] & get your CD handy to put in
B - Try to delete the index.dat from the Temp and replace from another
machine (with same OS) or just boot up and see if the system will create
a new one.
C- Try system restore to an earlier Day ( a week ago).
Did you assign it in the trusted sites.
Also try to look to your BHO (Browser helper Object) and Disable the non-MS
and see if the issue will resolve.
If all Okay, try to renable the BHO one-by-one and see which will be the
Culprit in this scenario.
Please try one step (A,B,C) at a time and Reboot your machine.
Regards,
nass