HTTP headers: x_csize: 0 with sitemap generator 8.2 on PHP 7.3

[paypal978]

Hello
I'm using Sitemaps since several yrs. Great product
However, I've got since about 2 weeks the following pb : HTTP headers: x_csize: 0.
I've tried the "toggle CURL" in config, but still same problem.
Could you help ?
Thx in advance

[XML-Sitemaps Support]

Probably there is a configuration problem - it looks like your server doesn't allow local network connections via port 80 (http) or 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?