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Bug #9427 PHP hangs when packets aren't returned when using session_start()
Submitted: 2001-02-23 13:06 UTC Modified: 2001-10-16 01:40 UTC
From: rargo at mcleodusa dot com Assigned:
Status: Closed Package: Session related
PHP Version: 4.0.4pl1 OS: Linux Mandrake 7.2
Private report: No CVE-ID: None
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From: rargo at mcleodusa dot com
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 [2001-02-23 13:06 UTC] rargo at mcleodusa dot com 
Short script:
<? mysql_connect("10.0.0.244", "user", "passwd");?>
Really any socket connection code.

Configure Command:
'./configure' '--with-apxs=/usr/sbin/apxs' '--with-mysql=/usr'
 '--with-mcrypt=../mcrypt-2.2.6' '--with-mhash=../mhash-0.8.4' '--with-ldap' '--with-fdftk' '--with-pdflib' '--with-zlib' '--with-gd' '--with-pspell' '--with-oci8' '--with-java=/opt/IBMJava2-13' '--enable-sigchild'

Pretty much the default php.ini.

We noticed this occurring once we put the machine inside a DMZ.  If PHP tries to connect to an address that the DMZ isn't allowing, the DMZ throws the packets away and PHP sits there waiting for a response.  This only happens when session_start() is called in the page.  If session_start() is commented out, the normal PHP warnings appear telling me of mysql or ldap not being able to connect.

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 [2001-05-07 12:49 UTC] derick@php.net 
Marking as fix before 4.0.6
 [2001-10-16 01:40 UTC] ssb@php.net 
I'm not sure what PHP should do here.  If an external library (mysql) does a connect and your firewall drops packages, that's a configuration problem and IMHO not something PHP should go to great efforts to try handling.  I think you will find that most software behaves this way (hangs until tcp connect times out) when facing a similar setup.
 
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