[TYPO3] 4.0 Extension Manager Issues

[Ryan Off]

After installing Typo3 4.0 I am not able to get in to the extension  
repository to download any other extensions. When I try to search the  
extension repository I get the message:

Error: The extension MD5 sum could not be fetched from  
extensions.md5. Possible reasons: network problems, allow_url_fopen  
is off, curl is not enabled in Install tool.

I have modified my php.ini file to have my resources at a high limit  
(as shown below): allow_url_fopen = On
max_execution_time = 120
max_input_time = 120
memory_limit = 256M

Any thoughts on what could be the problem? I have checked the web and  
mailing lists and not been able to find a solution. My web host is  
aplus.net.

Ryan Off