fail to crawling

[lespresson]

hi,need help!
An error occured
There was an error while retrieving the URL specified: [external links are visible to admins only]
Error message: Error opening socket to [external links are visible to admins only]
HTTP Code:

HTTP headers:
x_csize: 0

HTTP output:

[XML-Sitemaps Support]

Probably there is a configuration problem - it looks like your server doesn't allow local network connections via port 80 (http) - as a result sitemap generator is not able to crawl the site. This is usually related to firewall installed at the host - could you please contact your hosting support regarding this?

[lespresson]

i have try crawling in nonlocal machine ,and the sitemap can be generated but something wrong with the format when submitting to google,please help
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Sitemap is HTML
Your Sitemap appears to be an HTML page. Please use a supported sitemap format instead.

[XML-Sitemaps Support]

What is the sitemap URL you submit?