PHP:尝试连接到内存缓存服务器,但获得“权限错误(13)”

When I try to connect to my memcache server, I get "... Permission Error (13) ..." in my PHP error log. I can connect through telnet and even get a response, but can't connect through PHP.

The script works when run from the command line, but when run through Apache it fails.

Any ideas?