string $host = null - The host to connect to ( either an IP address or a domain name). This parameter can be left out, if it has been set in the constructor or manually!
int $port = null - The port to connect to on the server. This parameter can be left out, if it has been set in the constructor or manually!
The returned PEAR_Error object in case of an error is unspecific. You can ignore the errornumber and errormessage, because only "Connection failed" will be returned if the connection fails.