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please update to the latest build of LSWS 4.0.12.
If you are using 4.0.12, just do "force reinstall" from web console.
Just check phpinfo() output, you may get different value for mysqli.default_socket when different mysql libraries are linked. what you have done is correct.
Make sure temp partition is not full.
You should upgrade to 3.3.24 or 4.0.12, just change the version number in the download link to get it. 3.3.24 is in "3.0" folder, just change "4.0" to "3.0".
The request filter error bug has been addressed with an update of 1.7 release. please try "Force reinstall" from the web console to apply the latest build.
You can try some script that can help you setup chroot environment. Chroot is very difficult to get it right, especially when something goes wrong.
And you cannot use it with control panels.
You can apply a trial key to try the enterprise version.
Just try
ldd /downloads/lsws-4.0.12/admin/fcgi-bin/admin_php
of the 32bit packet, then you need to install the missing libraries if you got that.