Are there important reasons to change the access permissions? My host: Inmotion hosting, has strongly advised me not to change the permissions of any of my files or folders to 666 or 777. That doing so would open a backdoor to the server to hackers. Following their advice I have left the permissions of the ror.xml and sitemap.xml files at 644; and the generator file at 755. So far I have not noticed any issues with doing this: I was able to generate all of my sitemaps and submit the xml sitemap to google with no problem.? Thanks.