I have two links that show a single post. I need to remove one of them, because I get "Duplicate title tag" warnings in Google Webmaster Tools.
How can I remove a permanent URL from WordPress?
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It seems you have two pages/URLs that show the same post. Ordinarily I would have suggested removing one of these "permalinks" in WordPress - that URL would then return a 404. However, it would seem that these two permalinks have existed for a while(?) and have been indexed and possibly linked to.
So, it might be better (at least in the short term) to 301 redirect one URL to the other in .htaccess (in your document root) using mod_rewrite.
RewriteRule ^path/to/permalink-1 /path/to/permalink-2 [R=301,L]
This should come immediately after the existing
RewriteEngine On directive and before WordPress's own rewrites.