found it! It was being caused by mod_deflate: cd /etc/apache2/mods-enabled mkdir ../HIDE mv *deflate* ../HIDE /etc/init.d/apache2 restart woohoo! Sorry if I wasted anyones time. -rj -----Original Message----- On Tue, Jan 03, 2012, rj@xxxxxxxxx wrote: Hi, Here's what I have, after a brand new install: Ubuntu 11.04 Apache 2.2.17 Perl 5.10.1 Even with a stock Apache install, it buffers my Perl CGI output. (I've found this also happens on my home Ubuntu-10.10/Apache-2.2.16/Perl-5.10.1) It's not the (Perl) CGI script. It's not the browsers (tested with Firefox, Chrome both local & remote) Everything works as intended on numerous other (RedHat) Linux systems using older Apache (2.2.3). A simple example Perl CGI program to illustrate this is: #!/usr/bin/env perl use CGI; my $q = new CGI ; $| = 1 ; # flush stdout print $q->header( "text/html" ) ; print $q->start_html( -title => "test" ); for ( my $i=0 ; $i < 5 ; $i++ ) { print "<h2> $i ... </h2>" ; sleep(1) ; } print $q->end_html . "\n" ; Although this happens with a stock Apache config, a simple bare-bones example in /etc/apache2/sites-enabled/my-machine is: <VirtualHost *:80> ScriptAlias /cgi-bin/ "/var/www/cgi-bin/" <Directory "/var/www/cgi-bin"> Options None AllowOverride None Order allow,deny Allow from all </Directory> </VirtualHost> According to what I've read, after Apache 1.3, output should not be buffered and it isn't on my other systems. I had high hopes that a similar description I found in the archives caused by SSI using 'Options +Includes" might be it, but that doesn't apply here. Any ideas? This is driving me nuts... thanx, -rj --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx