I have a problem for my domain .. www.gtrcenter.org - It has PR3 but gtrcenter.org- It has unknown PR . What can i do to resolve the problem ..? In wordpress, i cant change it to use both www and non www urls .
You really shouldn't try to use both - Only use one. If I was you, I would keep it as the www version and then the non-www version will redirect to the www version. Easily done by setting the URL correctly in Wordpress. This is better for SEO purposes.
www.gtrcenter.org and gtrcenter.org does not the same. Google will look it as two different domain and of course give it different page rank.
You should redirect one of your URL's to the other using L301 redirection via .htaccess More information about the subject could be easily found by Googling URL Canalization
you are lucky because your www. has pr 3. my site www.babegamer.com pr was 4 and http://babegamer.com was 2 and I converted non www. to www. and now. the PR is 2 for both. damn. if I had converted both to non www. , my pr would not down to 2 I thought that when we did htaccess, pr will be the higher pr. But.......... Noone caution me about that.
Your website have canonical issues with home page. according to google www and non www web page are different page with same content. This is canonical issue and have duplicate web content, your all search engine optimization values distributed in these pages. Try to use .htaccess or uniform url through the website to handle this canonical issue.
You know they are the same site, I know it's the same site but Google Bot is stupid and needs to be told it's the same. You need to do a 301 redirect to your preferred url in .htaccess or IIS so Google Bot knows it's the same.
401 Redirect your pr0 to your pr3 (Not the other way around!!!) Also, within your webmaster tools for the site (if you haven't verified this on WM T then I'd recommend it) set your preferred domain to your PR3 domain. Not a massive weight on this setting but every little helps Cheers