# 522 responses
Cloudflare answers with 522 for requests timeouts (opens new window). This problem can happen to pages when a tenant has configured their DNS to point to Fastly as expected.
# Url with port
Fastly does not allow connections using a port directly in the URL. Any page that uses a port in its URL won't work after activating MarfeelCDN, and should be moved.
Marfeel recommends changing that URL to a subdomain, for example:
example.com:8443
To become
cms.example.com