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Intermittent problems in connecting to my server.

N/A

Intermittent problems in connecting to my server.

Hi ...

this is the second day in a row, that in the morning i can't connect to my home server.
I know the server is running fine, i can dial-in through my phone line at home, but if i try to connect from the internet to hit, it will tell me network timeout.

by doing a simple traceroute i get (the same thing was happening yesterday):

9	108	Timed out	107		4.68.128.101	as-0-0.bbr1.london2.level3.net

10 107 108 107 4.68.128.109 as-0-0.bbr1.london1.level3.net
11 107 106 106 212.187.131.40 ge-11-0.ipcolo2.london1.level3.net
12 120 121 120 195.166.129.211 gi1-1-22.pth-gw3.plus.net
13 Timed out Timed out Timed out -
14 Timed out Timed out Timed out -
15 Timed out Timed out Timed out -


exactly the same results as from yesterday.
I also know that if i managed to pass the first gw in the plus.net and be able to contact the second gw within plust.net, then i have access to my home server.

Can you please explain why is this happening? Any help on solving this issue?

regards

Muffley
12 REPLIES
Community Gaffer
Community Gaffer
Posts: 12,959
Thanks: 750
Fixes: 69
Registered: 04-04-2007

Intermittent problems in connecting to my server.

Hi,

When did this start occurring? Does it coincide with the completion of our ADSL upgrade to the 622mbps BT Centrals?? If it only began a couple of days ago then this is unlikely.

The reason I ask is that we had a few reports from customers unable to connect to VPNs and the like following the platform upgrade. In all cases, lowering the customers MTU settings to 1458 seemed to sort things out. AFAIWA our network engineers actually increased the MTU settings at the gateways so this shouldn't really be an issue.

Having said that, it's certainly something worth looking. A good resource for calculating MTU/RWIN values can be found at www.dslreports.com/tweaks. Another obvious suggestion would be to lower or disable the firewall at the server side .

Regards,

Bob Pullen
Plusnet Products Team
If I've been helpful then please give thanks ⤵

N/A

working now, but i didn't change a thing!

Yeap, i have access again, and i did touch my server.
i am still at work.

the traceroute now is giving:

10 9 4.68.127.45 so-2-3-1.edge1.dallas1.level3.net
7 9 9 9 4.68.96.121 so-7-0-0.bbr2.dallas1.level3.net
8 44 44 44 64.159.0.230 ae-0-0.bbr2.washington1.level3.net
9 107 107 108 4.68.128.101 as-0-0.bbr1.london2.level3.net
10 107 107 107 4.68.128.109 as-0-0.bbr1.london1.level3.net
11 107 108 106 212.187.131.148 ge-9-0.ipcolo2.london1.level3.net
12 120 121 121 195.166.129.211 gi1-1-22.pth-gw3.plus.net
13 121 121 120 195.166.129.222 ge1-1-0-23.ptn-gw1.plus.net
14 121 121 123 212.159.1.145 gi1-0-901.ptn-ag1.plus.net
15 Timed out Timed out Timed out -

the last timeout is correct becuase i am refusing ping packets.

this start happening yesterday morning, and happened again today.
let's see if it happens again tomorrow. if it happens... i will be back...

Thanks for the support.
N/A

And it was from 9:26 to 14:37 the lost connection

Hi again ...

I just logged into my server, and i could quickly check the connection weren't coming in to the server from around 9:26 to around 14:37. if this helps.

by looking into the "dropped" packets by the firewall between these times there were none., and they after 14:37 i start getting again the normal dropped packets every 30 s or so...

regards
Ianwild
Grafter
Posts: 3,835
Registered: 05-04-2007

Intermittent problems in connecting to my server.

Are you sure the connection was up and running during these times?

We don't operate any packet inspection or blocking on our network and so it would seem very weird if the link was operating, but not accepting connections.

Regards,

Ian
Community Gaffer
Community Gaffer
Posts: 12,959
Thanks: 750
Fixes: 69
Registered: 04-04-2007

Intermittent problems in connecting to my server.

Hi,

In addition to Ian's comments I've just checked our Radius logs:-

195.166.128.122 ended 15:22 22/Feb/2005 unknown (Termination by server side (NAS) Modem) 212.56.109.237 14:29 22/Feb/2005 15:22 22/Feb/2005 0:52:3

195.166.128.24 ended 09:41 22/Feb/2005 unknown (Error in end-user input) 212.56.109.237 15:20 21/Feb/2005 09:41 22/Feb/2005 18:21:23

Looks like your connection was down between 09:41 and 14:29. That might explain things.

Regards,

Bob Pullen
Plusnet Products Team
If I've been helpful then please give thanks ⤵

N/A

Intermittent problems in connecting to my server.

Hi...

thanks for the feedback...
the connection seems to be gone down again.

But what i don't understand is how can the conncetion have been down.
the server and the modem are always on.

can this be related to the phone line?
thanks
N/A

Intermittent problems in connecting to my server.

And thinking a bit more about the setup that i have running.

can this be related to the fact i am not using dhcp, but just assigning the IP address to the network if that talks with the ADSL modem wich is then connected to PLus.net?

the modem is a DLink i believe 300G+
Ianwild
Grafter
Posts: 3,835
Registered: 05-04-2007

Intermittent problems in connecting to my server.

I doubt it is a DHCP issue.

Your router could be dropping the connection for any manner of reasons. Does it store any logs you can access?
LiamM
Grafter
Posts: 5,636
Registered: 12-08-2007

Intermittent problems in connecting to my server.

Drops the line after a period of inactivity? Or you have a fault on the line?
Community Gaffer
Community Gaffer
Posts: 12,959
Thanks: 750
Fixes: 69
Registered: 04-04-2007

Intermittent problems in connecting to my server.

The first thing I would suggest monitoring is whether or not synchronisation is lost during these periods of down time. I have responded to your support ticket suggesting a similar course of action.

Kind Regards,

Bob Pullen
Plusnet Products Team
If I've been helpful then please give thanks ⤵

N/A

Intermittent problems in connecting to my server.

Ok...

i will check if i can get some logs.
but i don't believe i will have access to the logs from the modem itself..

by the way i am running on the server FreeBSD 5.3, and a simple firewall setup, and things have been working rather fine until this week. the uptime for the server this morning when i left home was 17 days and something.

i am curious in what are the factors that the connection/line is dropped.

once again you are making a customer very happy with your feedback and support. Thank you very much and keep up the good work.
Community Gaffer
Community Gaffer
Posts: 12,959
Thanks: 750
Fixes: 69
Registered: 04-04-2007

Intermittent problems in connecting to my server.

The most likely cause is loss of sync ie. your router/modem dropping the ADSL signal from your telephone exchange.

Our Radius logs do not give a clear reason as to what caused your connection to drop however is doesn't look to be anything relating to idle time out settings etc.

If sync is not lost during periods of inactivity, further disagnostics would be required before suggesting a course of action. If you have access to an alternative router or modem, it would certainly be worth trying because hardware faults are a very tricky thing to pinpoint.

Kind Regards,

Bob Pullen
Plusnet Products Team
If I've been helpful then please give thanks ⤵