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Cannot access a particular site

notheruser
Grafter
Posts: 139
Registered: ‎08-01-2008

Re: Cannot access a particular site

Quote from: Vikpal
Thanks for the responses.
The forum and the main site are hosted off different servers , I have it from the owners themselves.
My question is why does the forum fail to resolve via plus.net but works via a proxy server. Doesnt this indicate a issue with the way plus.net handles traffic to this site?

This does not necessarily point to PlusNet. In work we need to access a major UK based commercial service, which shall remain nameless to protect the guilty! They advised us not to use our proxy server "for performance reasons". (Mind you, the same "expert" idiot advised us to set our local cache sizes to 10's of Gigabytes). We found that the site frequently timed out - this was on a 10Mb leased line with no contention. We put our users back through the proxy server, and although the site still gave some problems, they were dramatically reduced.
Bear in mind that a proxy server does not just forward requests to a web site - it reads the browser request, and makes its own new request. There may be a considerable number of differences between the way the browser handles the request, and the way the proxy server does it. (You may find, as we did, that other browsers work better than IE).
Unless you were able to ping, and can't now, I'd read nothing into that - ping is often disabled as a simple security anti-DOS measure.
"Plus.net just doesnt seem to forward traffic to it at certain times during the day" - are you sure? It may be that the site is busier at certain times of day than others, and any timing issues or browser compatibility issues will be exacerbated by this.
HPsauce
Pro
Posts: 6,998
Thanks: 146
Fixes: 2
Registered: ‎02-02-2008

Re: Cannot access a particular site

Another important point is that if you can get there via a Proxy, the Proxy is very likely to be caching, so this will hide any intermittent availability.
It sounds very much like the web site (forum) itself is having the problems.
Oldjim
Resting Legend
Posts: 38,460
Thanks: 787
Fixes: 63
Registered: ‎15-06-2007

Re: Cannot access a particular site

I don't think that is necessarily correct as I can reach it every time when on the RIN connection but never on the PlusNet connection
mikeb
Rising Star
Posts: 463
Thanks: 15
Registered: ‎10-06-2007

Re: Cannot access a particular site

It's simply a routing problem surely ?
Initial part of tracert to main site:
Quote
1 9 ms 192.168.1.1 Router-adsl
2 28 ms 195.166.128.72 lo0-plusnet.pte-ag2.plus.net
3 23 ms 84.92.4.90 ge0-0-0-504.pte-gw2.plus.net
4 24 ms 212.159.1.101 te2-4.pte-gw1.plus.net
5 23 ms 193.203.5.86 ge0-1.lonap.lon.rapidswitch.com


Initial part of tracert to forums:
Quote
1 4 ms 192.168.1.1 Router-adsl
2 30 ms 195.166.128.72 lo0-plusnet.pte-ag2.plus.net
3 23 ms 84.92.4.90 ge0-0-0-504.pte-gw2.plus.net
4 * * no response * - - -
5 * * no response * - - -

As pointed out by someone much earlier (who got it in just before I did !) all requests to "forums.bharat-rakshak.com" don't appear to leave the PN network.  Whether this is specifically a PN problem or more of a general problem with DNS or routing data for the site(s) in question is anyone's guess ... but the fact that both sites are accessible via (some) other networks tends to suggest a PN problem I think.
Also works just fine on ye olde dialup via Le Freeswerve avec l'orange Tongue but the server doesn't respond to ping/tracert.
Quote
1 205 ms 195.92.168.49 - - -
2 133 ms 195.92.168.2 ge7-0.4.pbr-1.brm.as5388.net
3 191 ms 195.92.55.158 pos0-0.ber-1.the.as5388.net
4 202 ms 195.50.91.65 - - -
5 197 ms 4.68.116.126 ae-32-54.ebr2.London1.Level3.net
6 241 ms 4.69.137.78 ae-44.ebr1.NewYork1.Level3.net
7 207 ms 4.69.134.74 ae-81-81.csw3.NewYork1.Level3.net
8 224 ms 4.69.134.105 ae-83-83.ebr3.NewYork1.Level3.net
9 234 ms 4.69.132.89 ae-3.ebr3.Washington1.Level3.net
10 210 ms 4.69.134.162 ae-63-63.csw1.Washington1.Level3.net
11 251 ms 4.69.134.129 ae-61-61.ebr1.Washington1.Level3.net
12 227 ms 4.69.132.193 ae-4-4.car1.Cleveland1.Level3.net
13 329 ms 4.69.132.198 ae-11-11.car2.Cleveland1.Level3.net
14 235 ms 4.78.59.10 ENET-INC.car2.Cleveland.Level3.net
15 229 ms 206.222.25.106 g5-2.c4.xlhost.com
16 * * no response * - - -

Hmmmmmm, looks rather like the problem is perhaps with 80.239.193.141 which I guess means it's a TeliaSonera issue (or I suppose it could still be PN using outdated or incorrect routing info and it shouldn't attempting this route in the first place or it isn't actually routing it to TeliaSonera at all when it should be !)  Routing via Level3 (and maybe others) is just fine but routing via PN/TeliaSonera fails and it obviously depends on which routing is taken as to whether the site is accessible or not which clearly varies with ISP.  I still think it looks much more like a PN issue than anything else.
Quote
1 9 ms 192.168.1.1 Router-adsl
2 27 ms 195.166.128.72 lo0-plusnet.pte-ag2.plus.net
3 21 ms 84.92.4.90 ge0-0-0-504.pte-gw2.plus.net
4 21 ms 80.239.193.141 - - -
5 25 ms 80.91.248.94 ldn-bb2-link.telia.net
6 60 ms 213.248.65.114 prs-bb2-pos6-0-0.telia.net
7 33 ms 80.91.251.114 prs-b4-link.telia.net
8 29 ms 213.248.98.122 global-124046-prs-b4.telia.net
9 126 ms 64.209.101.122 - - -
10 124 ms 206.222.25.106 g5-2.c4.xlhost.com


B T Plusnet, a bit kinda like P T Barnum ...

... but quite often appears to feature more clowns Tongue
HPsauce
Pro
Posts: 6,998
Thanks: 146
Fixes: 2
Registered: ‎02-02-2008

Re: Cannot access a particular site

Quote from: Oldjim
I don't think that is necessarily correct as I can reach it every time when on the RIN

Ooops yes, you're right. Sorry I missed that!
I like the idea of it being "simply" a routing problem though. For mere mortals is there such a  thing as a simple routing problem?
paulby
Grafter
Posts: 1,619
Thanks: 1
Registered: ‎26-07-2007

Re: Cannot access a particular site

It could also be an MTU issue if it's available via RIN and not PN. 
Try changing the MTU to 1430 using DrTCP as described here.
pierre_pierre
Grafter
Posts: 19,757
Thanks: 3
Registered: ‎30-07-2007

Re: Cannot access a particular site

no to many of us cant access it to be that
paulby
Grafter
Posts: 1,619
Thanks: 1
Registered: ‎26-07-2007

Re: Cannot access a particular site

Quote from: pierre_pierre
no to many of us cant access it to be that

Only if everyone who can't access the site has their MTU set to 1430!
It's worth a try anyway - I can't test just now as I'm not on a PN connection (I'll try when I get home).
jelv
Seasoned Hero
Posts: 26,785
Thanks: 971
Fixes: 10
Registered: ‎10-04-2007

Re: Cannot access a particular site

RIN MTU 1500 or 1430 - no problem
Normal Plusnet - MTU 1500 or 1430 - both fail
jelv (a.k.a Spoon Whittler)
   Why I have left Plusnet (warning: long post!)   
Broadband: Andrews & Arnold Home::1 (FTTC 80/20)
Line rental: Pulse 8 Home Line Rental (£14.40/month)
Mobile: iD mobile (£4/month)
James
Grafter
Posts: 21,036
Thanks: 5
Registered: ‎04-04-2007

Re: Cannot access a particular site

Thought I'd just chip in to say that I can't access it from the work connection either.
paulby
Grafter
Posts: 1,619
Thanks: 1
Registered: ‎26-07-2007

Re: Cannot access a particular site

@jelv
Thanks for testing - saves me a job when I get home Smiley
mikeb
Rising Star
Posts: 463
Thanks: 15
Registered: ‎10-06-2007

Re: Cannot access a particular site

Quote from: HPsauce
I like the idea of it being "simply" a routing problem though. For mere mortals is there such a  thing as a simple routing problem?

Grin Is there such a thing as a "simple" routing (or any other) problem for anyone never mind mere mortals !  I just meant there is bugger all that any individual user can do about it other than use an alternative ISP or wait for someone else to investigate and hopefully fix it.  If a connection is apparently not being made satisfactorily outside of the PN network then that's where any user messing around can end because the problem is nothing to do with the user and they cannot influence the route being attempted.  The PN routing apparently works just fine to other sites at the same hosting location but not to one specific site.  Alternative routing via alternative ISPs works just fine regardless of the specific site.
cp:red Please do not try to avoid the word censor mod:end


B T Plusnet, a bit kinda like P T Barnum ...

... but quite often appears to feature more clowns Tongue