Error opening socket

[email21]

Im getting the following error when trying to create a sitemap. All settings have been set including the server ip address but Im still gettting the following error

There was an error while retrieving the URL specified:
Error message: Error opening socket to
HTTP headers follow:

HTTP output:

[XML-Sitemaps Support]

Hello,

please let me know your generator URL/login in private message to check this.