Linux Forums unreachable.

Thu Feb 25 05:30:29 UTC 2010

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> Today's Topics:
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>    1. Re: Linux Forums unreachable. (Ray Parrish)
>    2. Re: Linux Forums unreachable. (Christopher Chan)
>    3. Re: Linux Forums unreachable. (Ray Parrish)
>    4. Re: OpenOffice update problem (Gryllida)
>    5. Ubuntu (Lloyd Miller)
>    6. Re: OpenOffice update problem (Jim Byrnes)
>    7. problem (prem)
>    8. Re: OpenOffice update problem (Chris Luck)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 24 Feb 2010 17:39:22 -0800
> From: Ray Parrish <crp at cmc.net>
> Subject: Re: Linux Forums unreachable.
> To: ubuntu-users at lists.ubuntu.com
> Message-ID: <4B85D4CA.3030407 at cmc.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Markus Sch?nhaber wrote:
>   
>> 24.02.2010 02:51, Ray Parrish:
>>
>>   
>>     
>>> Markus Sch?nhaber wrote:
>>>     
>>>       
>>   
>>     
>>>> That's indeed strange: UDP packets do reach the target, TCP packets don't.
>>>>
>>>> @Ray: you don't have any packet filter active on your machine or your
>>>> DSL router, do you?
>>>>   
>>>>       
>>>>         
>>> No, but I note that the router portion of it is blocking one specific 
>>> web site that does not match linuxforums.org. I suppose I could remove 
>>> that entry, and retry if you think that could be the problem.
>>>     
>>>       
>> OK, let's see what we do know:
>> - you can't establish a TCP connection to port 80 at www.linuxforums.org,
>> - the problem is not caused by a DNS failure,
>> - UDP packets do reach www.linuxforums.org,
>> - TCP packets don't
>> In fact, the last point isn't exactly true. All we know is that
>> traceroute -T doesn't receive a response from www.linuxforums.org. That
>> could mean that either the probe itself gets thrown away on the server
>> side or that the probe does reach the server but the response to the
>> probe is dropped somewhere.
>>
>> Judging from the above, I can imagine two possible causes of the problem:
>> 1. linuxforums.org/theplanet are - for some reason unknown to me -
>> indeed blocking you (or an IP range which contains the IPs you are
>> assigned) from access to their site.
>> 2. Something at your side (DSL router/computer) is throwing away some
>> network packets thus making it impossible for you to access
>> www.linuxforums.org.
>>
>> If 1. is true, there's not much you can do about other than, for
>> example, asking them about the problem via mail or on #linuxforums IRC
>> channel on freenode.
>> If there's another QWest customer in your neighbourhood and you could
>> make them check their access to www.linuxforums.org, that would give a
>> hint too.
>>
>> If 2. is true, you have to find out what exactly it is that blocks
>> communication with linuxforums.org.
>> What I'd try:
>> - Boot the machine from a LiveCD and check if it makes a difference. If
>> it doesn't, this pretty much rules out your machine as source of the
>> problem.
>> - Change the router's configuration to not block anything and check if
>> it makes a difference.
>>
>> While not exactly helping to find the culprit, it might nevertheless be
>> interesting to see if the problem is specific to port 80. I. e. if you
>> telnet to a different port (21, 53, 443, 8443 for example seem to be
>> open on linuxforums.org) will a connection be established?
>>
>> Other than that, I don't have any ideas, sorry.
>>   
>>     
> Hello again,
>
> I have a dual boot machine, and from Windows XP I can connect to 
> linuxforums.org easily.
>
> Here are the non-connecting results of the other ports -
>
> ray at RaysComputer:~$ telnet www.linuxforums.org 21
> Trying 174.132.123.98...
>
> ray at RaysComputer:~$ telnet www.linuxforums.org 53
> Trying 174.132.123.98...
>
> ray at RaysComputer:~$ telnet www.linuxforums.org 443
> Trying 174.132.123.98...
>
> ray at RaysComputer:~$ telnet www.linuxforums.org 8443
> Trying 174.132.123.98...
>
> ray at RaysComputer:~$
>
> I tried to change my settings for the router to remove the one blocked 
> web site while in Windows, but it would not load any other pages after 
> loading the log in, then the routing table page.
>
> Something in Ubuntu is blocking me from reaching linuxforums.org, and I 
> would like some coaching on all of the possible things that can block a 
> certain web site from being reached.
>
> Could it be a firewall rule? I have some ports blocked, and have a 
> blacklist policy in effect, as opposed to white listing traffic.
>
> Thanks, Ray Parrish
>
>   
I have been having this problem since my last experiment crashed my 
system.  Still not having found a method to backup and restore my 
bookmarks I do it in 1890's fashion.  Today I brought up Firefox and 
typed in http://www.linuxforums.org omitting the /forums from the 
address and clicked the Forums link in the Nav Box and presto, I was 
there.  I'm not an Ubuntu Guru but this worked for me and I hope it 
works for others.

And here's hoping that the musings of this old fossil doesn't peeve the 
experts again.

-- 
Bond Servant,
Bill Taylor
Killer Spade 806 CE
1968-'69

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