several web sites work and one does not

[spike]

I have installed the generator on several of our sites, in most cases successfully. However on one of the sites whenever the crawler is started after twenty seconds or so the software bails out with the following error:
[external links are visible to admins only]

Please help, I cannot understand what is wrong

[admin]

Hello,

this usually means that firewall is installed at the server that prevents local network connection for php scripts via port 80 (http). Please check that with your hosting support to finetune firewall settings and allow crawling of the site.