SymptomsParallels Plesk Panel 8.x/9.x and Parallels Plesk Sitebuilder 4.5 were installed on the same server and Sitebuilder support was enabled for Plesk domains. Sites were opened in Sitebuilder 4.5 Wizard through
Parallels Plesk Panel > Domains > domain.tld > Edit in Sitebuilder
After upgrading Parallels Plesk Panel to version 10.x/11.x button "Edit the site in Sitebuilder 4 or Site Editor" appeared for the domain at
Subscriptions > domain.tld > Website & Domains
It leads to Wizard of old Parallels Plesk Sitebuilder 4.5. For details refer to this KB article.
However the button does not work. Error "Unable to connect" appears.
CauseWhen click "Edit the site in Sitebuilder 4 or Site Editor" Parallels Plesk Panel tries to open the following URL:
Where 188.8.131.52 is IP Address used by Sitebuilder web site. Windows firewall blocks incoming connections to port 2006.