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Trouble connecting to server
http://www.x404.co.uk/forum/viewtopic.php?f=4&t=22699		 Page 1 of 1
Author:  forquare1 [ Thu Oct 16, 2014 8:06 pm ]
Post subject:  Trouble connecting to server
Good evening all,

I have a VPS, manaha.co.uk. On it I run a few websites, and a Minecraft server. Over the past two weeks I've been having some issues:
If I try to connect to the server via the Minecraft client, or SSH, it either times out or connects after a long while and doesn't stay up long (SSH is better, but VERY laggy).
I've got a decent ping, between 30ms-80ms usually, and HTTP works just fine, I can happily connect to any one of the websites.

Here's an example of traceroute, it has been better, but this is fairly typical…
Code:
$>traceroute manaha.co.uk
traceroute to manaha.co.uk (109.74.197.101), 64 hops max, 52 byte packets
 1  dsldevice (xxx.xxx.xxx.xxx)  92.638 ms  96.248 ms  99.976 ms
 2  * * *
 3  * * *
 4  * * *
 5  * * *
 6  * * *
 7  * * *
 8  * * *
 9  * * *
10  li144-101.members.linode.com (109.74.197.101)  3243.528 ms  80.030 ms  1143.826 ms


This problem isn't always present, some evenings I have no issue at all, others I do. Interestingly, if I connect to a VPN (I've signed up for a month worth of Anonine) my problems seem to clear. Both my iMac and my iPhone suffer the same problem, however if I turn off WiFi on my iPhone it connects via SSH flawlessly.

I've contacted my IPS (Plusnet) and after a bit of battling, they reported that:
Plusnet wrote:
Thanks for your patience in this matter.

Please disregard my previous reply, I have performed some further checks on your line and although at a first glance everything does seem to be fine.

After a little more digging it does seem you were on a profile which may have been caused you some issues and could have been the cause of packet loss which you have seen as a degraded service.

I have now reset your line and this should put your line onto a more stable profile for you, Please allow around 4 hours for the reset to complete.

As we have reset your line this will now put your lane into a new 10 day training period, please ensure your router is on and active at all points during this period as disconnections can cause your line to not get its full speed.

We appreciate your patience in this matter and we apologise for any inconvenience this may have caused.


Sent 09/10/14, so not quite 10 days ago. Since that email I've rebooted the router twice as it had lost connection, I was working from home and not having internet wasn't an option, the reboot restored my connection. Apart from that, I've got nothing. Since their email my server hasn't been too bad, however this evening it has dipped drastically again, and I'm getting ticked off.

Does anyone have the remotest idea about what is happening here? I would understand if it was traffic shaping, but seeing as they give games a "platinum" service I don't think so? And if a game was the reason, I don't get why SSH is also effected? Also, the trace route is sh*t, and yet HTTP traffic is just fine…

And reasoning would stop me from going bald, and it would be a shame if I did go bald - I'm hoping to pull an Einstein as I go grey...
Author:  saspro [ Fri Oct 17, 2014 3:04 pm ]
Post subject:  Re: Trouble connecting to server
Either packet loss, mtu mismatch or an oversubscribed DSLAM.

I'm guessing packets to anything requiring secure connections is failing as packets are arriving out of sequence or damaged so it's dropping them
Author:  rustybucket [ Fri Oct 17, 2014 11:15 pm ]
Post subject:  Re: Trouble connecting to server
If you try multiple (~100 or so) pings with a size of 85-90% your MTU, what happens?
Author:  forquare1 [ Sat Oct 18, 2014 5:26 pm ]
Post subject:  Re: Trouble connecting to server
rustybucket wrote:
If you try multiple (~100 or so) pings with a size of 85-90% your MTU, what happens?


Currently getting pings of ~56ms. However I shall try again when I notice the server playing up :)
Author:  forquare1 [ Sat Oct 18, 2014 5:28 pm ]
Post subject:  Re: Trouble connecting to server
saspro wrote:
Either packet loss, mtu mismatch or an oversubscribed DSLAM.

I'm guessing packets to anything requiring secure connections is failing as packets are arriving out of sequence or damaged so it's dropping them


Hmm, I don't have HTTPS on the server so can't test that, but HTTPS to other sites works fine, I've not got another box I could SSH to anymore, so that'd be a difficult one to test…
My MTU is, according to my router, "1.500", which looks to be, errr, about correct…?
Author:  forquare1 [ Sun Oct 19, 2014 8:26 am ]
Post subject:  Re: Trouble connecting to server
I'm experiencing the issues again this morning, and ping still gives fairly acceptable results:

Code:
$>ping -c 100 -s 1350 manaha.co.uk
PING manaha.co.uk (109.74.197.101): 1350 data bytes
<--snip-->
--- manaha.co.uk ping statistics ---
100 packets transmitted, 100 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 65.878/92.774/121.633/13.098 ms
Author:  big_D [ Mon Oct 20, 2014 6:39 am ]
Post subject:  Re: Trouble connecting to server
It sounds like their admin staff are as au fait with computers as they are with the English language! That support email was absolutely appalling, it was painful to read.

Sounds like an over subscribed internet connection that is breaking on 'unknown' secure connections, because they 'aren't important' and can't be cached, so are getting low priority? By unknown, I mean that your site is not a Google or Amazon etc.
Author:  forquare1 [ Tue Oct 21, 2014 6:20 pm ]
Post subject:  Re: Trouble connecting to server
That makes a lot of sense, Dave. Just noticed that Steam is similar, again a secure connection that can't be cached - though I'd have thought it would be 'known' and so given some sort of priority...
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