Unable to start session: session has already been started

Support & Bugs
1

Hi, I am running the latest version of Piwik (2.5.0) and whenever I want to enter Piwik’s dashboard, I get this error message:


WARN Piwik\Session[2014-08-18 08:39:31] [00f18] Unable to start session: session has already been started by session.auto-start or session_start()
Debug: the original error was session has already been started by session.auto-start or session_start()

I have searched for this error and I think, I can pinpoint it to my usage of the Ninja Web Application Firewall. There seems to be a solution to the problem shown on the WordPress forums here, which basically suggests to replace


session_start()

with


if (! session_id() ) { session_start(); }

As it is not that easy (and not at all wise, IMHO) to change core-files - is there another way to make Piwik work again with the Web Application Firewall installed?

2

Hi mkalina, it’s a bit strange that your firewall would require changes in the PHP source code of Piwik.
Maybe you could change the firewall software or disable it for your piwik server?

3

Hi,

Not the firewall requires the changes, but the way I set up Piwik:

[ul]
[li] domain.tld (it is https)
[/li][li] domain.tld/piwik (which, comfortably, can be reached through https, too)
[/li][/ul]

If I move Piwik to a subdomain, I need to purchase another certificate. The firewall checks everything under domain.tld.

So as far as I can see there is no way to make them work together on your side?