[OPLINTECH] Calling all Gurus

[Chad Neeper]

Doing a packet trace with Wireshark running on the laptop directly
connected to the OPLIN router might give you a little more information on
exactly where the problem is. For instance, perhaps DNS isn't resolving the
address correctly.

Could try going directly to the IP address and see if that works.

FWIW, I just browsed to http://www.usps.com and the site switched itself to
https:   If there was caching involved upstream, that could be a concern to
me. http caching is ok, but HTTPS network traffic should be encrypted and
readable only between the computer and the web server. It isn't normally
cacheable. The only way to cache https is to effectively create a
man-in-the-middle attack. I doubt OPLIN would be doing https caching. So
the problem probably isn't http caching.

Bill just brought up the point (offlist) that if the IP is blacklisted, the
telnet connection test might still work ok but die later. He very well
could be right. At this point, his is the only suggestion that I can think
of that could still be plausible.

I guess the packet trace would tell us more.

______________________________
*Chad Neeper*
Senior Systems Engineer

*Level 9 Networks*
740-548-8070 (voice)
866-214-6607 (fax)

*Full LAN/WAN consulting services -- Specialized in libraries and schools*

On Tue, Sep 9, 2014 at 11:21 AM, Chad Neeper <cneeper at level9networks.com>
wrote:

> A problem I see with that theory is that she said she already used telnet
> to test the connection and it responded correctly. But still may be
> possible.
>
> ______________________________
> *Chad Neeper*
> Senior Systems Engineer
>
> *Level 9 Networks*
> 740-548-8070 (voice)
> 866-214-6607 (fax)
>
> *Full LAN/WAN consulting services -- Specialized in libraries and schools*
>
> On Tue, Sep 9, 2014 at 11:16 AM, Bill Hardison <bhardison at norweld.org>
> wrote:
>
>> It looks like what I have seen when an IP address is blacklisted or in
>> some other way blocked by the "other guy" or their firewall.  Contact the
>> USPS and see if they have any such procedure in place.
>>
>>
>> *Bill*
>>
>> *You rush a miracle man, you get rotten miracles.*
>> Miracle Max: The Princess Bride (1987)
>>
>> *This message and any response to it may constitute a public record and
>> thusmay be publicly available to anyone who requests it.*
>>
>>
>> On Tue, Sep 9, 2014 at 10:33 AM, Mindy Holmes <holmesme at oplin.org> wrote:
>>
>>>  I am experiencing a unique problem.  There is a particular website that
>>> won't load within our library (I will list the URL below).  It is a link to
>>> the USPS to print a return label for Alibris.  The link does not work on
>>> any PC in our network.  Here is what I have tried:
>>>
>>>
>>>    - Mulitiple Browsers
>>>    - Multiple Browser with not add-ons
>>>    - Temporarily disabling antivirus software
>>>    - Watching the traffic pass through the firewall - no blocks
>>>    - Plugging a laptop that the linked worked on from home directly
>>>    into our OPLIN router
>>>    - Pinging the IP address for the site
>>>    - Telnet to the site on port 80 and running - GET / HTTP/1.1 host:
>>>    returns.usps.com  (which does respond as it should)
>>>
>>>
>>> The link still will not load.  It just endlessly cycles and eventually
>>> times out.   I am sure there is a needle in the haystack I have missed.
>>> Any thoughts on what this could be are greatly appreciated.  Here is the
>>> ornery URL:
>>>
>>>
>>> https://returns.usps.com/CreateLabel.aspx?MRSID=313600&DisplayType=Customer&ShippingInfoIncluded=No
>>>
>>> Mindy Holmes
>>> Mason Public Library
>>>
>>>
>>>
>>> _______________________________________________
>>> OPLINTECH mailing list
>>> OPLINTECH at lists.oplin.org
>>> http://lists.oplin.org/mailman/listinfo/oplintech
>>>
>>>
>>>
>>
>> _______________________________________________
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>>
>>
>
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