CI 2.2 gives Mycrypt error on Linux ISP servers

[eluser]vincej[/eluser]
HI - I upgraded to 2.2. on my VPS host at InMotionHosting. The user Linux for their servers.

When I turn on CRSF in the config I get an error displayed on the page:

Code:

An Error Was Encountered The action you have requested is not allowed.

So I had a look into my error logs and there is a php error appearing at the same time as I click the page with the error page:

[16-Jun-2014 15:03:44 UTC] PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/lib/php/extensions/no-debug-non-zts-20090626/php_mcrypt.dll' - /usr/local/lib/php/extensions/no-debug-non-zts-20090626/php_mcrypt.dll: cannot open shared object file: No such file or directory in Unknown on line 0

The ISP reported to me the obvious answer:

The reason for that is that DLL files are Windows based files only, and our servers only run Linux. However, the Mcrypt files should be located in /opt/libmcrypt You will need to adjust your code as necessary.

So, at the moment I have turned off CSRF .

Question: How do I get Mcrypt to work on a Linux server ?

Question: How can I use CRSF without getting the "The action you have requested is not allowed" error

Many Thanks !