This 20s to 1m delay sounds like a classic DNS reverse lookup
waiting to time out.
Probably your server software does a reverse DNS lookup before
letting the client log on. Maybe the external IP of the firewall
doesn't have a reverse mapping?
Trying figuring out what IP they appear to be connecting from
and then do a "ping -a" to it. If the first line doesn't
display a DNS name, but rather a numeric IP, that's your problem.
Time to try to talk some sense into that IT department of theirs?
:-)
[EMAIL PROTECTED] wrote:
>
> I'm in charge of deploying an application which uses HTTP-tunneling
> to go through firewalls.
> With one of our clients we experience strange behavior :
> it seems that opening an HTTP connexion sometimes take a very
> long time (20s to 1 mn) but in general once the connexion is opened
> then the download times are very short (often 30Kbytes/s) : that's
> fine for big files but awful for an application which open/close lot of
> HTTP connexions.
>
> Is such a behavior possible ?
> How du u explain it ?
>
> Our client can't tell us about his firewall/proxy configuration
> because his network administrators don't want to deliver informations
> about that. All we now is that there's a proxy and a firewall, the
> bandwidth is 1Mb, and the Internet access is shared by about 300 users.
>
--
Mikael Olsson, EnterNet Sweden AB, Box 393, S-891 28 �RNSK�LDSVIK
Phone: +46-(0)660-105 50 Fax: +46-(0)660-122 50
WWW: http://www.enternet.se E-mail: [EMAIL PROTECTED]
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