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This is a strange error. For months, I have not been able to reach Stackexchange sites from my home connection (Starhub, Singapore). I get HTTP 101 Connection reset. I can ping Stackoveflow.com but when using telnet to manually connect with HTTP I get connection reset. It's probably not device dependent because I can't reach the site on any device at my home connection.

It works on my 3G subscription and at my work, and they point to the same IP. Anyone have a clue why this may happen? It seem to me either the ISP cuts off connections to Stackexchange, or Stackexchange resets connections from this ISP/IP range.

Trace from working 3G (removed first). Ironically my 3G is with the same ISP but takes a very different route:

--- Nice Trace to Stackoverflow.com ---

2) 203.116.22.194 (203.116.22.194) 82.080 ms, 12/12 ps, 0.0% loss [AS 9874] Singapore
3) 203.117.190.85 (203.117.190.85) 83.811 ms, 12/12 ps, 0.0% loss [AS 4657] Singapore
4) anutsi10.starhub.net.sg (203.118.3.162) 79.970 ms, 12/12 ps, 0.0% loss [AS 4657] Singapore
5) ge9-0.singapore2.sin.seabone.net (93.186.133.49) 76.617 ms, 12/12 ps, 0.0% loss [AS 6762] Singapore
6) pos7-0.singapore1.sin.seabone.net (213.144.176.46) 89.246 ms, 12/12 ps, 0.0% loss [AS 6762] Singapore
7) tinet.singapore1.sin.seabone.net (213.144.176.82) 90.452 ms, 12/12 ps, 0.0% loss [AS 6762] Singapore
8) xe-2-2-0.nyc20.ip4.tinet.net (89.149.181.181) 351.992 ms, 11/11 ps, 0.0% loss [AS 3257] France
9) peer1-gw.ip4.tinet.net (77.67.70.194) 339.281 ms, 11/11 ps, 0.0% loss [AS 3257] Germany
10) * * *
11) * * *
12) gwny01.stackoverflow.com (64.34.41.58) 331.457 ms, 11/11 ps, 0.0% loss [AS 13768] United States
13) stackoverflow.com (64.34.119.12) 335.087 ms, 11/11 ps, 0.0% loss [AS 13768] United States

And here is on the fixed connection that does not get HTTP connectivity to stackoverflow.com . As you can see, it can connect on IP (but still not HTTP).

--- Nice Trace to Stackoverflow.com ---

2) 172.20.15.1 (172.20.15.1) 16.502 ms, 38/38 ps, 0.0% loss European Union
3) 172.26.15.1 (172.26.15.1) 16.117 ms, 38/38 ps, 0.0% loss European Union
4) 172.20.7.94 (172.20.7.94) 16.371 ms, 38/38 ps, 0.0% loss European Union
5) 172.20.7.70 (172.20.7.70) 28.843 ms, 38/38 ps, 0.0% loss European Union
6) 203.117.35.193 (203.117.35.193) 26.341 ms, 38/38 ps, 0.0% loss [AS 38861] Singapore
7) so-6-0-2.edge5.sanjose1.level3.net (4.53.28.1) 229.370 ms, 38/38 ps, 0.0% loss [AS 3356] United States
8) vlan60.csw1.sanjose1.level3.net (4.69.152.62) 231.066 ms, 38/38 ps, 0.0% loss [AS 3356] United States
9) ae-71-71.ebr1.sanjose1.level3.net (4.69.153.5) 217.601 ms, 38/38 ps, 0.0% loss [AS 3356] United States
10) ae-2-2.ebr2.newyork1.level3.net (4.69.135.186) 298.774 ms, 38/38 ps, 0.0% loss [AS 3356] United States
11) ae-72-72.csw2.newyork1.level3.net (4.69.148.38) 302.946 ms, 38/38 ps, 0.0% loss [AS 3356] United States
12) ae-2-70.edge1.newyork1.level3.net (4.69.155.78) 300.939 ms, 38/38 ps, 0.0% loss [AS 3356] United States
13) * * *
14) gig2-0.nyc-gsr-b.peer1.net (216.187.123.5) 289.141 ms, 38/38 ps, 0.0% loss [AS 13768] United States
15) gwny01.stackoverflow.com (64.34.41.58) 284.903 ms, 36/37 ps, 2.7% loss [AS 13768] United States
16) stackoverflow.com (64.34.119.12) 285.089 ms, 34/37 ps, 8.1% loss [AS 13768] United States
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1  
What does a trace route show? (A while back there was a routing issue at a carrier that impacted SO.) –  Richard Oct 29 '11 at 9:11
    
Added traces above –  RipperDoc Oct 30 '11 at 8:37

2 Answers 2

Have you tried a different MTU? You can do this on your PC; routers generally neither split nor reassemble IP packets.

Open a command prompt as admin, and type:

netsh
interface
ipv4
set subinterface "Local Area Connection" mtu=1000

You can add store=persistent to the last command to make the change survive reboots.

If you have admin rights on your work PC, capture a Wireshark trace and see what happens.

share|improve this answer

Sometimes, if you can't access some web sites, the problem is in the MTU. You can try lowering it in your modem and see if it changes something.

share|improve this answer
    
I doubt that it is related to this as this would affect more than just this website - most likely his ISP has screwed up the route/similar. –  William Hilsum Oct 29 '11 at 9:12
    
@WilliamHilsum When I had problems of MTU, only a small percentage of sites was affected (let's say 10% of the sites I normally visit), so it would be possible. –  xanatos Oct 31 '11 at 19:13

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