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Old 04-08-2012, 09:30   #1
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cdn.cruisersforum.com broken since 2 days

...which means no icons and no attachements
The http server connects but never responds, in the example below I Ctrl-C'ed after about 2 minutes.

Code:
sysadm@jmx:~$ wget http://cdn.cruisersforum.com/forums/images/editor/bold.gif
--2012-08-04 17:25:26--  http://cdn.cruisersforum.com/forums/images/editor/bold.gif
Resolving cdn.cruisersforum.com (cdn.cruisersforum.com)... 93.184.221.133
Connecting to cdn.cruisersforum.com (cdn.cruisersforum.com)|93.184.221.133|:80... connected.
HTTP request sent, awaiting response... ^C
sysadm@jmx:~$
I am located in Sweden.

Code:
Tracing route to gs1.wpc.edgecastcdn.net [93.184.221.133]
over a maximum of 30 hops:

  1     *        *        *     Request timed out.
  2     1 ms     1 ms     1 ms  static-213-115-251-74.sme.bredbandsbolaget.se [213.115.251.74]
  3     2 ms     3 ms     2 ms  ti3002d322-ge2-1-0.ti.telenor.net [146.172.106.201]
  4    45 ms    45 ms    44 ms  ti3002c310-ae11-0.ti.telenor.net [146.172.98.81]
  5    44 ms    44 ms    44 ms  ti3003c310-ae0-0.ti.telenor.net [146.172.100.70]
  6    46 ms    44 ms    44 ms  ti9002b300-ae0-0.ti.telenor.net [146.172.105.38]
  7    29 ms    30 ms    29 ms  decix.edgecast.com [80.81.194.37]
  8    29 ms    30 ms    29 ms  93.184.221.133

Trace complete.
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Old 04-08-2012, 09:36   #2
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Re: cdn.cruisersforum.com broken since 2 days

You're trying to mirror the site?
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Old 04-08-2012, 09:41   #3
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Re: cdn.cruisersforum.com broken since 2 days

No, just browsing it.
The site itself is working fine but I get no responses from the cdn server.
(Tried with a multitude of browsers and OS'es)

Seems to me to be Edgecast that has a broken edge node for my IP block.
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Old 05-08-2012, 11:59   #4
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Re: cdn.cruisersforum.com broken since 2 days

Here is a network capture of a typical request that get NO response from cdn.crusiersforum.com. The server (93.184.221.133) just keeps the connection open without ever replying....

GET /forums/images/editor/bold.gif HTTP/1.1
Host: cdn.cruisersforum.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:14.0) Gecko/20100101 Firefox/14.0.1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
Referer: Displaying Sea Surface Temperature (SST)
Cookie: cflastvisit=1344093052; cflastactivity=0; __qca=P0-313910263-1344093048169; __utma=197938301.380448892.1344093048.1344184569.1 344187134.12; __utmz=197938301.1344093048.1.1.utmcsr=(direct)|ut mccn=(direct)|utmcmd=(none); cfuserid=19705; cfpassword=*censored here*; cfsessionhash=f8b462f1f2e123a4b8a9193a9bd5663e; __utmc=197938301; __utmb=197938301.13.10.1344187134
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Old 06-08-2012, 12:25   #5
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Re: cdn.cruisersforum.com broken since 2 days

Are you running an ad blocker? If so, can you please make sure that cdn.cruisersforum.com is whitelisted?
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Old 06-08-2012, 12:35   #6
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Re: cdn.cruisersforum.com broken since 2 days

In the posts above I have included output from "wget", a low level http communication application, and from a network monitoring application which sits on the network IP protocol stack itself.

This information is way passed any point where an ad-blocker or even a firewall could be interfering with the communication, which is why I included it.

wget is a stand alone application that just performs a raw http request.

And the dump of the http request I did just to show you that the request IS getting throuh to the server and the TCP connection IS open, but there is still no reply.
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Old 06-08-2012, 12:40   #7
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Re: cdn.cruisersforum.com broken since 2 days

I suggest you perform a traceroute of your request. I suspect this is an issue on your network as we are unable to reproduce it from several different points of access here. If it continues to be a problem and your network cannot figure it out, I suggest you create a path in your host file to point cdn.cruisersforum.com to www.cruisersforum.com.
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Old 06-08-2012, 12:46   #8
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Re: cdn.cruisersforum.com broken since 2 days

$ tracert cdn.cruisersforum.com

Tracing route to gs1.wpc.edgecastcdn.net [93.184.221.133]
over a maximum of 30 hops:

1 1 ms 1 ms 1 ms 172.16.1.80
2 2 ms 2 ms 2 ms static-213-115-251-74.sme.bredbandsbolaget.se [213.115.251.74]
3 3 ms 2 ms 2 ms ti3002d322-ge2-1-0.ti.telenor.net [146.172.106.201]
4 45 ms 58 ms 55 ms ti3002c310-ae11-0.ti.telenor.net [146.172.98.81]
5 45 ms 66 ms 46 ms ti3003c310-ae0-0.ti.telenor.net [146.172.100.70]
6 45 ms 45 ms 45 ms ti9002b300-ae0-0.ti.telenor.net [146.172.105.38]
7 48 ms 31 ms 30 ms decix.edgecast.com [80.81.194.37]
8 30 ms 29 ms 30 ms 93.184.221.133

Trace complete.
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Old 06-08-2012, 12:59   #9
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Re: cdn.cruisersforum.com broken since 2 days

Works fine from behind a firewall, here at amd in austin texas.
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Old 06-08-2012, 13:17   #10
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Re: cdn.cruisersforum.com broken since 2 days

Obviously I'm not claiming it doesn't work at all, then users would be up in arms...

I'm just claiming it doesn't work from my particular network. This is either a routing problem or a server misconfiguration problem, and the former seems less likely since I cannot find any other server that has any problem. And believe me, I use a lot of them...
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Old 06-08-2012, 13:28   #11
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Re: cdn.cruisersforum.com broken since 2 days

Well.. What do you know... Although it seemed less likely, I decided to investigate the routing, and indeed, it is a routing problem with my particular provider!

Sorry for the wild chase, guys.

Most annoying though, since it still means I can't see peoples attachments...
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Old 06-08-2012, 13:30   #12
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Re: cdn.cruisersforum.com broken since 2 days

This sounds like an MTU problem somewhere in the path. One or more routers are configured to not fragment and ICMP packets are blocked somewhere in the path or at the server.
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Old 06-08-2012, 13:39   #13
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Re: cdn.cruisersforum.com broken since 2 days

Thanks for the update to let us know you found the problem.
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Old 06-08-2012, 13:40   #14
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Re: cdn.cruisersforum.com broken since 2 days

We will see what the customer support help-desk says tomorrow... probably the usual

Anyway, a hosts file entry pointing cdn.cruisersforum.com to 173.192.60.130 was a most effective workaround.

Thx
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