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I did a fresh install and I could not get to the modules admin page because it always reported that the module did not exist. The following line in common.php was the problem.
$url_arr = explode('/', str_replace(str_replace('https://', 'http://', XOOPS_URL.'/modules/'), '', 'http://'.$HTTP_SERVER_VARS['HTTP_HOST'].$xoopsRequestUri));
HTTP_HOST returns the actual servers hostname. This always fails because I am using a virtual server with a virtual hostname. I changed HTTP_HOST to SERVER_NAME and that returns the correct host name.