- Apache server
- Apache "mod_rewrite" extension
- PHP 5.3.3 or greater
- PHP GD library (with Freetype-Support)
- PHP PDO module
- PHP mbstring module
- PHP curl module
- PHP json module
- PHP safe mode OFF
- MySQL 5 or higher
- 30+ Mb free disk space
- Magic Quotes OFF (recommended)
This is standard feature set
All these features usually available on any standard PHP / MySQL hosting. The only thing you should pay attention to is the version of PHP that should be at least 5.3.
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Read and watch how to install ImpressPages CMS.
ImpressPages is not tested on nginx, but some users use it http://www.impresspages.org/cms/forum/viewtopic.php?f=6&t=441&p=2293#p2293
ImpressPages CMS is incompatible with Varnish cache.