Free Online Sitemap Generator - Error Message

[Bodo]

I received the following error message when I select START.  HELP!
My Site is accessible via port 80


There was an error while the URL specified: [external links are visible to admins only]
Please make sure to specify the correct website URL and resubmit your request.

[admin]

Hello,

perhaps there is a problem with network connection between xml-sitemaps server and yours, please check back after a while and see if that works.

[Bodo]

I appreciate your response. The problem occurred on Thursday of last week.