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Wordpress Update/Plugin Install fails

GlennT

Basic Pleskian
I'm wresting with a problem with Wordpress' Automatic Plugin Install and Upgrade which uses FTP to download and install/upgrade.

I can usually install small plugins but larger plugins usually fail. Wordpress is able to quickly download the entire zip file and unpack it to the upgrades folder but can't successfully move the files to the wp-content/plugins folder.
It usually manages to install some files but not the entire plugin. It's not a permissions issue since Wordpress uses FTP to upload and install which bypasses permissions. I suspect proftpd needs to be tuned or there's something else altogether causing this problem. I know the problem is with me since I just migrated a wordpress site (XXAMP) which handled plugin installs very quickly easily. Now it doesn't work most of the time. I'd had this problem on a previous server also with this newer server as well.

I've already tried adding ftp variables to the wp-config.php file which didn't make a difference, increase WP memory, played with the php.ini timeout settings and memory. I also tweaked proftpd conf file timeout settings.

Any ideas on where I can look to correct this problem.

Thanks in advance.
 
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