The Availability Reports generation never ends

[tgriep]

One thing you can try is to edit the /etc/hosts file and on the following line

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127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4

Add your servers host name and FQDN also.
Then restart the Apache daemon by running

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service httpd restart

Try running the report again and see if that helps.
The 504 error is pointing to a DNS resolving the IP address problem.