Error when trying to crawl https: x_csize: 0

[info3093]

We have changed our site to onlo SSL. Now I got following error message:

There was an error while retrieving the URL specified: https://(OURDOMAIN)
HTTP Code:

HTTP headers:
x_csize: 0

HTTP output:

[XML-Sitemaps Support]

Hello,

Probably there is a configuration problem - it looks like your server doesn't allow local network connections via port 443 (https) - 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?

[info3093]

When I try, for example, to load a site with "wget" via the console it is not a problem.

[XML-Sitemaps Support]

Please try to enable "Use curl" setting in generator configuration.

[info3093]

I just tried this. But there is no difference.

[XML-Sitemaps Support]

Hello,

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