Notice: A session had already been started

guest2 · Guest

when i try to see the graphs i get this message:

Notice: A session had already been started - ignoring session_start() in c:\apache\htdocs\cacti\include\top_graph_header.php on line 33

and everything is blocked!

Help!!

Bob · Guest

I'm seeing the exact issue as above...

Bob · Guest

Forgot the pertininent details...

Win2K Server (all patches and service packs on deck), Apache 2.0.47, Cacti 0.8.2a, MySQL 3.23.57, PHP 4.3.3, RRDTool 1.0.40. I might go up to Cacti 0.8.3 and see what happens, but my other Cacti install is running beautifully on 0.8.2.

Any thoughts anyone?

Guest · Posted: Tue Sep 02, 2003 10:32 am Post subject:

Ok, I've tried editing cacti/include/top_graph_header.php as mentioned in this thread - http://www.raxnet.net/board/viewtopic.php?t=1984&highlight=session , and there's still no joy. Same error. What's going on here? Anyone else besides guest2 and myself having this issue? I know next to nothing about PHP, so the error is a tad difficult for me to diagnose.

Anyone?

jimchris · Joined: 02 Oct 2003 Posts: 4

Fellow Cacti travelers on the Win32 side of the stream.

Here is some insight on no graphs being displayed.

Let me know if you see the same results.

Thx

Jim Christophersen
Windward Engineering
New York

Installed is Cacti 0.8.3a.

Supporting applications:

Apache 2.0.47-win32,
PHP 4.3.3-win32,
ActiveState Perl 5.8.806-MSWindows

The platform system is Win2k server/sp3 + IE6/SP1.

An interesting REPEATABLE sequence that does display a graph.

1. Launch Cacti's entry page & login as admin.

2. Choose the graph's tab.

3. Click the second tree( in my case a successfully polled router)

Watch the lower left corner of your browser, see the "graph_view.php?action=tree..."

wait 10 seconds and click on the browser stop button.

Ta Da we have a graph, it is consistent with the desired parameters.

So I turned on activestate's komodo IDE and ran "graph_view.php?action=tree..."

up came from within "cacti\include\auth.php"

PHP Warning: session_start(): Cannot send session cookie
- headers already sent in C:\Apache2\htdocs\cacti\include\auth.php on line 40

To confirm that it is a real issue, thanks to Welling & Thomson pg 435, open a file like phpinfo.php in the htdocs/cacti directory:

This is what I see

.........................................Web display of http://traffic.webnslookup.com:8080/cacti/phpinfo.php
test1
this is PHP.

Warning: session_start(): Cannot send session cookie - headers already sent by (output started at C:\Apache2\htdocs\cacti\phpinfo.php:10) in C:\Apache2\htdocs\cacti\phpinfo.php on line 16

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at C:\Apache2\htdocs\cacti\phpinfo.php:10) in C:\Apache2\htdocs\cacti\phpinfo.php on line 16
the contents of $sess_var is hello world

.........................................htdocs/cacti/phpinfo.php.....................................

<HTML>
<HEAD>
<META NAME="GENERATOR" Content="SAPIEN Technologies PrimalScript 3.0">
<TITLE>Document Title</TITLE>
</HEAD>
<BODY>


test1<br>

<?PHP

/* Insert your PHP code here */

echo "this is PHP.<br>";

session_start();
session_register("sess_var");
$sess_var = "hello world";
echo "the contents of \$sess_var is $sess_var<br>";

phpinfo();

?>

</BODY>
</HTML>
......................................................................................................

Let me know if any of you see a similar result.