Port 80 and Duplicate Content

[AnthonyMangia]

The SEOmoz Web App is showing me that every single URL on one of my clients' domains has a duplicate in the form of the URL + :80.

For instance, the app is showing me that www.example.com/default.aspx is duplicated in the form of www.example.com:80/default.aspx

Any idea if this is an actual problem or just some kind of reporting error?  Any help would be appreciated.

[RobertFisher]

Anthony,

I can't tell you if this is the same issue, but Megan with SEOmoz just responded to a question re duplicate content:
http://www.seomoz.org/q/duplicate-page-content-and-titles

Again, may be helpful, may not. But there was a bit of a bug.

Best

[AdoptionHelp]

I'm willing to bet its an issue with their crawler as Robert mentions above.

While you wait on confirmation for this, make sure that your web server is not configured to serve to any unnecessary ports. For the vast majority of sites, you only need to listen to the default port 80. This apache doc may help you with this.