After installing Helicon Zoo in IIS to deploy python django app on IIS I ve got with other applications, which were deployed before and working, HTTP 503. Logs give next information (for DefaultWebSite):
A listener channel for protocol 'http' in worker process '100' serving application pool 'DefaultAppPool' reported a listener channel failure. The data field contains the error number.
Other apps give the same warnings and errors. Please HELP.
Update: I have uninstalled Helicon Zoo and deployed site with Apache, now it works perfectly.