[NTLUG:Discuss] Weird Connection problem (REPOST)

[Stephen Davidson]

Hi Lee.

I am posting the to the User Group as well, so that this will be available to anyone else who runs into this.

Your last suggestion fixed this issue.  I have it enabled for the new kernel I am presently building, so for obvious reasons, I will be looking at
what this does a little more closely before a actually build that new kernel.  I vaguely remember the docs saying something about broken firewalls
can break this?  Is this correct?

With the number of hassles this was causing me, I am not sure what the permanent solution should be, and I would like more info.

Thanks,
Steve

lee wrote:
well, i had a problem once where i built a kernel and enabled something in the networking section called "TCP Explicit Congestion Notification
support" and having this enabled prevented me from connecting to certain websites due to firewall issues.  it's explained a little bit on the help
screen for that option.

  > try this:
  >
  > $ cat /proc/sys/net/ipv4/tcp_ecn
  >
  > if it returns a "1" then issue (as root)
  >
  > $ echo 0 > /proc/sys/net/ipv4/tcp_ecn
  >
  > and see if that doesn't solve your connection issue.
  >
  > -- lee
  >
  > Stephen Davidson wrote:
  >
  >> Hi Lee.
  >>
  >> Stock install with SuSE 7.3.  Its a patched version of 2.4.10.  Not
  >> sure what the patches are, however.
  >> Would upgrading to 2.4.18 clean this up for me?
  >>
  >> -Steve
  >>
  >> lee wrote:
  >>
  >>>
  >>> have you built and installed a kernel lately or are you using the
  >>> stock install kernel that came with your distro?
  >>>
  >>> -- lee
  >>>
  >>> Stephen Davidson wrote:
  >>>
  >>>> Hi Kevin.
  >>>>
  >>>> This is something that has been driving me up the wall.
  >>>> Nothing is dieing on the traceroutes.  I can even PING
  >>>> the websites/domains in question. I just can't connect
  >>>> via http.  Or for that matter, telnet to port 80.
  >>>>
  >>>> -Steve
  >>>>
  >>>> Ward Networks wrote:
  >>>>
  >>>>  > Swbell is have D-slam problems for over a month now on Rback3 and
  >>>>  > rback13 which are core routers in the DFW area Stephen - use
  >>>>  > www.traceroute.org to check back to yourself and see which router
  >>>> your
  >>>>  > trace dies at on your different ISP connects.
  >>>>  >
  >>>>  > Kevin
  >>>>  >
  >>>>  >
  >>>>  > -----Original Message-----
  >>>>  > From: discuss-admin at ntlug.org [mailto:discuss-admin at ntlug.org] On
  >>>> Behalf
  >>>>  > Of Alton R. Pouncey, II
  >>>>  > Sent: Monday, May 13, 2002 10:58 PM
  >>>>  > To: discuss at ntlug.org
  >>>>  > Subject: Re: [NTLUG:Discuss] Weird Connection problem
  >>>>  >
  >>>>  > Can you traceroute to these sites?  Can you successfully telnet
  >>>> to port
  >>>>  > 80 on these sites?  If you can telnet to port 80 and do a GET
  >>>> then http
  >>>>  > connections should work.
  >>>>  >
  >>>>  > Alton
  >>>>  >
  >>>>  > On Mon, 2002-05-13 at 17:46, Stephen Davidson wrote:
  >>>>  >
  >>>>  >>Greetings.
  >>>>  >>
  >>>>  >>I am having a weird problem where about 1/3 of the sites I try to
  >>>>  >>
  >>>>  > visit (http) fail to connect.  I am using a couple of ISPs, so the
  >>>>  > problem is not
  >>>>  >
  >>>>  >>that one can't connect.  The really weird thing is that I can ping
  >>>>  >>
  >>>>  > them.  Any suggestions on where to look?
  >>>>  >
  >>>>  >>Sites affected include;
  >>>>  >>http://www.epicrealm.com
  >>>>  >>http://www.zdnet.com
  >>>>  >>http://www.ananova.com
  >>>>  >>
  >>>>  >>Netscape 6.2.2
  >>>>  >>Lynx Version 2.8.4rel.1 (17 Jul 2001)
  >>>>  >>Suse 7.3
  >>>>  >>
  >>>>  >>ISPs
  >>>>  >>Qwest
  >>>>  >>Earthlink
  >>>>  >>ISPWest
  >>>>  >>
  >>>>  >>
  >>>>  >>
  >>>>
  >>>>
  >>>>
  >>>> _______________________________________________
  >>>> http://www.ntlug.org/mailman/listinfo/discuss
  >>>>
  >>>
  >>>
  >>>
  >>
  >>
  >
  >
  >