vSphere Client 5.0 cannot connect to ESXi server.

Hello,

I recently restarted the management agents (using the VMWare tutorial) in order to solve some issues. However, that did not correct the issues, instead it has introduced more problems : Now, I cannot connect to the ESXi server with vSphere Client 5.0. I get the following error :

vSphere Client could not connect to "myesxiiserver".

An unknown  connection error occurred. (The request failed because of a connection  failure. (Unable to connect to the remote server)).

Moreover, when I try to access to https://myesxiipserver/, I get a 404 HTTP error.

But, I can access to the ESXi server by SSH and I can telnet the server with the port 902.

Does anybody know how I can fix this issue ?

Thanks.

Cheers and happy new year