Are all duplicate pages bad?

[Xee]

I just got my first Crawl Report for my forum and it said I have almost 9,000 duplicate pages. When I looked at a sample of them though I saw that many of them were "reply" links. By this I mean the "reply" button was clicked for a topic yet since the crawler was not a member, it just brought them to the login/register screen. Since all the topics would bring you to the same login page I'm assuming it counted all these "reply" links as duplicates. Should I just ignore these or is there some way to fix it? Thanks in advance.

[MRCSearch]

How does your forum handle the URLs for that login/register? Is it a ?string paramater after the base URL? If so, you should rel-canonical. If not, how does it handle those URLs?

[Xee]

I'm assuming it is a ?string parameter. Here's a few of them:

http://www.bearsfansonline.com/forum/posting.php?mode=reply&f=4&t=4272

http://www.bearsfansonline.com/forum/posting.php?mode=reply&f=6&t=5051

http://www.bearsfansonline.com/forum/posting.php?mode=reply&f=4&t=18

[MRCSearch]

Ah phpBB. First, do this:

http://www.phpbb.com/community/viewtopic.php?t=543997

That'll fix your ugly URL problem.

Then see what kinds of errors you get. If it still spits duplicate content, you can rel-canonical.

[Xee]

Thanks a lot. I'll try and make the modifications and post the results when I have them.