I have configured a VPS running CentOS 6.3 and Plesk 11. The install of a blank version of Wordpress works well. However, I have problems with updating Wordpress and searching for plugins. The two problems:
When trying to search a new plugin from within the Wordpress backend I get an 'Unknown error'. I have found a lot of references with people having this problem, however it is usually solved by the webhost as this is a server configuration issue. Since I am now my own webhost with the VPS, I would like to know how to solve this myself and improve my server configuration. I did not find anywhere online how to do this in practice.
A (most likely) related problem is that Wordpress does not show any new updates. The current version of my blank install is 3.4.2 but once logging in, Wordpress does not indicate that I should update to version 3.5. Also after performing an update check, Wordpress does not find the new version.
Updating everything manually (via FTP) works well of course. But I would like the update process from within wordpress to work.
Anyone any ideas how to improve my PHP or other configurations to solve these update problems? Any help appreciated!