Opened 4 years ago

Closed 4 years ago

Last modified 5 weeks ago

#672 closed request (fixed)

Can't connect to Stack Overflow

Reported by: ietf@… Owned by: cdoyle@…
Priority: minor Milestone: ietf-089
Component: incoming Keywords:
Cc: My Current Location:
My MAC Address: My OS:

Description (last modified by cdoyle@…)

In spite of otherwise very nice network connectivity, I am unable to 
connect to Stack Overflow (http://www.stackoverflow.com/) at all. I get 
an eventual connection timeout in the browser -- it seems to connect and 
I get some traffic back but the transfer never completes. I can't tell 
if the problem is with the site itself or some CDN that they're using, 
but I see similar performance with other Stack Exchange owned sites.

I haven't noticed any other outages.

I'm adjusting the priority of this ticket and changing the type

  -- Justin

Change history (8)

comment:1 Changed 4 years ago by llynch@…

Owner: changed from llynch@… to nkukich@…
Status: newassigned

we had this reported yesterday as well... may be on the stack overflow side.

comment:2 Changed 4 years ago by nkukich@…

Owner: changed from nkukich@… to cdoyle@…

comment:3 Changed 4 years ago by cdoyle@…

Description: modified (diff)
Priority: tbdminor
Status: assignedaccepted

Through some troubleshooting, we've determined that the v6 cdn.sstatic.net site that stackoverflow.com is calling on page-load seems to be borked. We actually connect successfully to cdn.sstatic.net, but it doesn't respond to http requests. Interestingly enough, if you disable v6, the page calls the v4 cdn.sstatic.net content with no issues and the page loads without incident.

We're going to send an email off to the stackoverflow.com people and see if they can give us any more information.

comment:4 Changed 4 years ago by cdoyle@…

Resolution: fixed
Status: acceptedclosed

This issue has been resolved. Closing the ticket.

comment:5 Changed 4 years ago by anonymous

Justin,

Can you test again? It looks like PMTUD wasn't working end to end on this site, and we had a backup tunnel via Hurricane Electric. We've dropped the tunnel ( and are hoping that the BT coverage is sufficient). Please let us know if you're working we'll close out the ticket.

  • Jim

comment:6 Changed 4 years ago by ietf@…

Resolution: fixed
Status: closedreopened
Hi Jim (et. NOC),

I can confirm that this is now working! Stack overflow seems to be 
running just fine.

Unfortunately as luck would have it, it turns out that the entry I was 
trying to hard to reach last night does not have a usable answer for the 
problem I was researching. This is, of course, not your fault. :)

On behalf of a large number of software developers here at IETF this 
week, I want to thank you very much for getting this site to work!

  -- Justin

On 2014-03-03 09:40, IETF Meeting/NOC wrote:
> #672: Can't connect to Stack Overflow
> ---------------------------+--------------------------------
>       Reporter:  ietf@…    |                Owner:  cdoyle@…
>           Type:  request   |               Status:  closed
>       Priority:  minor     |            Milestone:  ietf-89
>      Component:  incoming  |           Resolution:  fixed
>       Keywords:            |  My Current Location:
> My MAC  Address:           |                My OS:
> ---------------------------+--------------------------------
> 
> Comment (by anonymous):
> 
>  Justin,
>     Can you test again? It looks like PMTUD wasn't working end to end 
> on
>  this site, and we had a backup tunnel via Hurricane Electric. We've
>  dropped the tunnel ( and are hoping that the BT coverage is 
> sufficient).
>  Please let us know if you're working we'll close out the ticket.
> 
>      - Jim
> 
> --
> Ticket URL: <https://tickets.meeting.ietf.org/ticket/672#comment:5>
> IETF Meeting/NOC <https://tickets.meeting.ietf.org>
> IETF Meeting - NOC pages

comment:7 Changed 4 years ago by cdoyle@…

Resolution: fixed
Status: reopenedclosed

comment:8 Changed 5 weeks ago by Rick Alfvin

Milestone: ietf-89ietf-089

Milestone renamed

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