Google Sitemaps Warnings

Now I got Warning an all sitemaps : sitemap_XX.xml.gz
in Google Webmaster Tools.

URLs not followed
When we tested a sample of the URLs from your Sitemap, we found that some URLs were not accessible to Googlebot because they contained too many redirects. Please change the URLs in your Sitemap that redirect and replace them with the destination URL (the redirect target). All valid URLs will still be submitted. Help HTTP Error:
URL:
URL:
URL:
Found: 301 (Moved permanently) Help
http://www.site.com/forum/475125-post5.html
http://www.site.com/forum/466174-post10.html
http://www.site.com/forum/showpost.php?p=475249&postcount=7
Aug 2, 2008

indexed pages dropped from 500 000 to 171 000!!
wtf

Hello,

you should disable "Include old URLs" and "Include showpost URLs" options (since you have "Replace post number with permalink" feature used, you don't need showpost pages anymore).

Fixed, Thanks.