PHP errors not logged, blank PHP pages

[MH-Stefan]

Hello,

Last week we've switched from Apache to LSWS. So far we've been able to iron out most of the issues, except for one: it seems that some PHP errors aren't logged.
We have clients reporting that various scripts which worked flawlessly on Apache are now simply displaying a blank page. The error logs don't show anything and PHP error reporting is enabled.

The server is running PHP 5.2 in suPHP mode, with eAccelerator, mod_security and Suhosin.

Any advice would be greatly appreciated. Thank you in advance!

Regards,
Stefan

[NiteWave]

compare phpinfo() under apache and lsws, see if difference.

[MH-Stefan]

They're both identical. It seems that the issues we have may be caused either by Suhosin or by mod_security, but the errors are not logged or displayed anywhere. Any idea why Suhosin/mod_security errors aren't logged under LSWS?

Edit: Sometimes we get the error 406 with a blank page when submitting a form.

[NiteWave]

how about disable Suhosin in lsphp5, see if no error?

[MH-Stefan]

Thanks, I've turned on suhosin.simulation and now we can submit the form, but the suhosin errors are still not logged as they should.

[webizen]

are you using cpanel? did you also check stderr.log as well?