Re: Something makes curl hang for 5 minutes after connection refused

[Corinna Vinschen <corinna-cygwin@cygwin.com>]

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On Nov 30 20:42, Brian Inglis wrote:
> On 2018-11-30 12:49, Lee wrote:
> > On 11/30/18, Basin Ilya  wrote:
> >> Hi.
> >>
> >> Recently I noticed that `curl` does not fail immediately after connection
> >> refused, but waits for 5 minutes.
> >>
> >> This only happens on my machine and only with the `Cygwin` version of
> >> `curl`. The mingw version is unaffected.
> >> I tried downgrading curl, but it didn't help. I thought there's a rogue
> >> setting in `/etc` or in home or maybe some environment variable, but I
> >> couldn't find it.
> >>
> >>     basin@BASIN /cygdrive/c/Users/basin
> >>     $ >/dev/null /usr/bin/curl -v http://127.0.0.1:2/
> >>     * STATE: INIT => CONNECT handle 0x80048658; line 1404 (connection
> >> #-5000)
> >>     * Added connection 0. The cache now contains 1 members
> >>     *   Trying 127.0.0.1...
> >>     * TCP_NODELAY set
> >>     * STATE: CONNECT => WAITCONNECT handle 0x80048658; line 1456 (connection
> >> #0)
> >     <.. snip ..>
> >>     curl: (28) Connection timed out after 300145 milliseconds
> >>
> >>     basin@BASIN /cygdrive/c/Users/basin
> >>     $ /usr/bin/curl --version
> >>     curl 7.59.0 (i686-pc-cygwin) libcurl/7.59.0 OpenSSL/1.0.2p zlib/1.2.11
> >> libidn2/2.0.4 libpsl/0.18.0 (+libidn2/2.0.2) libssh2/1.7.0 nghttp2/1.31.0
> > 
> >> Can someone try to reproduce it?
> > 
> > I get the same behavior:
> > $ /usr/bin/curl -v http://127.0.0.1:2/
> > * STATE: INIT => CONNECT handle 0x600057ad0; line 1404 (connection #-5000)
> > * Added connection 0. The cache now contains 1 members
> > *   Trying 127.0.0.1...
> > * TCP_NODELAY set
> > * STATE: CONNECT => WAITCONNECT handle 0x600057ad0; line 1456 (connection #0)
> > * Connection timed out after 300324 milliseconds
> > * multi_done
> > * stopped the pause stream!
> > * Closing connection 0
> > * The cache now contains 0 members
> > curl: (28) Connection timed out after 300324 milliseconds
> > 
> > $ /usr/bin/curl --version
> > curl 7.59.0 (x86_64-unknown-cygwin) libcurl/7.59.0 OpenSSL/1.0.2p
> > zlib/1.2.11 libidn2/2.0.4 libpsl/0.18.0 (+libidn2/2.0.2) libssh2/1.7.0
> > nghttp2/1.31.0
> > 
> > 
> > I also get an almost immediate 'failed to connect' notice on windows:
> > C:\>C:\UTIL\curl\curl.exe -v http://127.0.0.1:2/
> > *   Trying 127.0.0.1...
> > * TCP_NODELAY set
> > * connect to 127.0.0.1 port 2 failed: Connection refused
> > * Failed to connect to 127.0.0.1 port 2: Connection refused
> > * Closing connection 0
> > curl: (7) Failed to connect to 127.0.0.1 port 2: Connection refused
> > 
> > with either version of curl:
> > C:\>where curl
> > C:\UTIL\curl\curl.exe
> > C:\Windows\System32\curl.exe
> 
> Ditto all the way!
> 
> Could this be caused by network speed improvements made to Cygwin a while back?
> Or were those patches never sent/received/applied from Daniel Havey (MS Windows
> Program Manager for Transports and IP)?

Somebody may want to bisect this...


Corinna

-- 
Corinna Vinschen
Cygwin Maintainer

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