x_csize: 0

[baga]

Hello,
I have this error in my sitemap :
There was an error while retrieving the URL specified: [ External links are visible to forum administrators only ]
HTTP Code:

HTTP headers:
x_csize: 0

HTTP output:

Do you have a suggestion to fix this?
Thanks.

[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?