I get this message when installing:

Network Connectivity test FAILED
Is cURL installed on your server? (it needs to be). If so, this may be a temporary glitch, try again in a few minutes.
Installation will NOT continue.

I used the curltester and yes, curl is installed and working correctly on the server.

In a past post, you mentioned about commenting lines out of the ozpost.php module? Tried that and it made no difference and I haven't read the posts in between there and here.

What can be causing this? If it is a server related problem, I need to explain to them what to check / look for.