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> Barely able to use forum - slow loading
U308
 Posted: Apr 27 2012, 04:15 PM
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I don't know where to post this, so feel free to have it moved.
Problem is that since 3 or 4 days ago loading of pages takes about 20 seconds.
Never had this before with the forum. What is the reason, or am I the only one ?
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tux99
 Posted: Apr 27 2012, 05:13 PM
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QUOTE (U308 @ Apr 27 2012, 06:15 PM)
I don't know where to post this, so feel free to have it moved.
Problem is that since 3 or 4 days ago loading of pages takes about 20 seconds.
Never had this before with the forum. What is the reason, or am I the only one ?


Must be a network problem somewhere between you and the forum server, for me the forum is as fast as always.
Try to do a traceroute to see where the bottleneck is.


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redman
 Posted: Apr 27 2012, 05:27 PM
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QUOTE (U308 @ Apr 27 2012, 06:15 PM)
... or am I the only one ?

Probably a technical thing at your end.
I'm not experiencing any problems from two different locations (two different ISPs).


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Nathan
 Posted: Apr 27 2012, 07:45 PM
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No problems for me either.
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Zugzwang
 Posted: Apr 27 2012, 07:58 PM
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Hi, I have the same problem as U308. It's taken me around fifteen minutes to log in and post two messages :\

Dunno if the problem is at my end or not because other sites are loading fine ..
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Jcink
 Posted: Apr 27 2012, 09:16 PM
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Because of significant attacks against the forum server we've had to add DDoS protection. I'm guessing your IP(s) might have been getting throttled or picked up by false positives, blocking some of our resources and making the page load slow. I have been working with the DDoS protection provider to resolve these problems although it's taking time to find the right balance.

If possible, providing your IP address to me via PM would allow me to whitelist you for the time being and/or check to see if you are in fact being blocked by the system or if it's just a routing issue.
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joka
 Posted: Apr 27 2012, 09:41 PM
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I have the same problem as Zugzwang. Are German providers under suspect? For me the forum is now nearly unusable.
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Jcink
 Posted: Apr 27 2012, 10:08 PM
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QUOTE (joka @ Apr 27 2012, 05:41 PM)
Are German providers under suspect?

no, they are not. it is purely an individual IP based blocking method and not one based by country or ISP.

I have checked our blocked IP logs and there's actually only 6 of them in there - none from germany.

I'd have to see some traceroutes to 72.8.190.101 to see if something else is up.
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Jcink
 Posted: Apr 30 2012, 12:18 AM
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I've contacted my provider.

Looks like there's a peering issue and they are going to look into it.
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joka
 Posted: May 2 2012, 05:08 PM
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I've found out what makes the difference between a fast and slow forum in the browser (at least for me):
The forum becomes very slow and buttons are not shown if third-party cookies are not accepted before the URL scientiflinuxforum.org is opened the first time.

Steps to reproduce:
  • Call Firefox in a sandbox: sandbox -X -t sandbox_web_t firefox
  • Edit->Preferences->Privacy->History->Use custom settings
  • Disable "Accept third-party cookies"
  • Open scientificlinuxforum.org
The forum software sets cookies "files.b1.jcink.com" and "sm.jcink.com" which will be blocked by this privacy setting, but are obviously necessary for a seamless working.
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U308
 Posted: May 3 2012, 08:43 AM
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joka, yes it works in Firefox. Thanks.
Unfortunately I have so far been unable to do this in Opera which is actually my main browser.
Will continue to check.

(Echt zum Kotzen)
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Jcink
 Posted: May 3 2012, 10:18 PM
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My provider is really dragging their feet getting this routing issue looked at. Sorry.
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U308
 Posted: May 6 2012, 10:46 AM
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biggrin.gif Jcink, back to full speed. Many thanks.
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Jcink
 Posted: May 6 2012, 11:16 PM
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biggrin.gif

Glad to hear. Sorry it took so long to get fixed. SLF and our server is much better protected now though.
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AndrewSerk
 Posted: May 8 2012, 08:03 PM
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Well, I guess it is my turn. This morning I had no issues but now I can barely use the forum.
I went from 11 hops when working well to over 30 hops now with most servers not responding with there info.
Going to try different DNS and see if it makes any difference.

Weird, I haven't changed DNS yet but get mixed load times now. Not sure what is going on.

EDIT:
I am having no issues using the forum today although my traceroute still looks "funny". unsure.gif

This post has been edited by AndrewSerk: May 9 2012, 06:33 PM
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zxq9
 Posted: May 20 2012, 01:50 AM
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Whoooly cow. I just caught the plague myself today.

Traceroute was topping out at 30+, just like you said, and load times were wacky. The textual load times were fine (specifically, if you surf with JavaScript turned off like I do most places, the text loading is OK, if you turn JS on nothing works correctly at these speeds, though, and you'll think the server is completely hung -- but just like most things involving JavaScript or cake, this is a lie.). The image load times are ridiculously slow -- so slow that forum specific images like thread status icons and similar will show me things I've not seen since the 9600baud days: boxes with substitute label text and an "x" (browsers still do that! good thing! So I can still see what the status of a thread is, just not with the icon.).

Anyway, so turning JS off or cutting straight to the chase and browsing with Lynx (hehe) is a workaround for when the forums get all crazy. Its usable, just really distant by hop count.

Here's some vanilla traceroute output:
CODE

[ceverett@taco ドキュメント]$ traceroute scientificlinuxforum.org
traceroute to scientificlinuxforum.org (96.242.25.2), 30 hops max, 60 byte packets
1  ntt.shinden.tsuriai.jp (192.168.1.1)  1.246 ms  1.787 ms  2.690 ms
2  133.205.129.197 (133.205.129.197)  19.140 ms  19.754 ms  20.222 ms
3  133.205.129.222 (133.205.129.222)  20.790 ms  21.429 ms  22.166 ms
4  203.136.56.44 (203.136.56.44)  43.391 ms  44.108 ms  44.558 ms
5  122.132.0.90 (122.132.0.90)  45.488 ms  46.297 ms  47.000 ms
6  122.132.0.113 (122.132.0.113)  47.712 ms  46.879 ms 122.132.0.93 (122.132.0.93)  69.133 ms
7  xe-6-1-3.a20.tokyjp01.jp.ra.gin.ntt.net (61.213.161.173)  48.450 ms  33.811 ms  34.064 ms
8  ae-6.r25.tokyjp01.jp.bb.gin.ntt.net (61.213.162.169)  34.737 ms  37.457 ms ae-6.r24.tokyjp01.jp.bb.gin.ntt.net (61.213.162.161)  38.281 ms
9  ae-9.r20.tokyjp01.jp.bb.gin.ntt.net (129.250.2.92)  54.982 ms ae-1.r20.tokyjp01.jp.bb.gin.ntt.net (129.250.2.20)  55.566 ms  56.090 ms
10  as-1.r20.sttlwa01.us.bb.gin.ntt.net (129.250.4.189)  176.937 ms  124.298 ms  177.950 ms
11  ae-1.r05.sttlwa01.us.bb.gin.ntt.net (129.250.5.47)  156.244 ms  152.183 ms  142.609 ms
12  0.xe-11-3-0.BR3.SEA1.ALTER.NET (204.255.168.37)  144.655 ms  145.174 ms  145.693 ms
13  0.ae3.XL4.SEA1.ALTER.NET (152.63.106.245)  116.518 ms  131.306 ms  131.756 ms
14  0.so-6-1-0.XT2.SEA7.ALTER.NET (152.63.104.230)  137.163 ms  125.996 ms  123.539 ms
15  0.so-7-2-0.SEA01-BB-RTR2.verizon-gni.net (152.63.105.250)  144.095 ms  139.946 ms 0.so-6-1-0.SEA01-BB-RTR2.VERIZON-GNI.NET.verizon-gni.NET (152.63.105.62)  136.714 ms
16  * * *
...


Interesting thing is, if I set "-m 100" I can get 100+ unresolved hops, so its not just stopping at 30. The chances of an actual 100+ hop (or even 30+, really) between any two public facing computers on the net is extremely unlikely (or even two computers tucked deeply away within a private network passing through a long VPN tunnel before hitting the network and then back again). This probably means someone's ISP has a circular route in operation somewhere that needs to get straightened out.

As in... someone didn't read the Cisco book very well, so actually getting complete data out of the loop is an entirely random proposition. Fortunately this seems to be affecting the media server more than whatever is sending rendered HTML, so shut JS off and browse away.
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Jcink
 Posted: May 20 2012, 08:25 PM
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Yesterday around the time you posted there was some serious network disruption going on, so that's probably what you were noticing. It should be fine today.
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