Symptoms
You are using Apache Http Web Server. The dispatcher is not using the URL already processed by mod rewrite. You have made sure that the line DispatcherUseProcessedURL is set to 1 in the Dispatcher configuration.
Resolution
In httpd.conf change
RewriteRule ^(.+)\.html(.*)$ $1.reg.%1.html$2
to
RewriteRule ^(.+)\.html(.*)$ $1.reg.%1.html$2 [PT]
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