title: proftpd on VPS - No such user found
body: <p>I'm running a brand new installed VPS with CentOS 6.6 and Plesk 12.0.18. I created a subscription and by default a FTP user is created. However, I cannot login with these credentials. I also created a new user but the same problem presists. I'm 100% sure that the username and password is correct.</p>
  
  <p>Filezilla gives me and <code>530 Login incorrect</code>. But if I look at the <code>/var/log/secure</code> file, I see this odd message (FTP username = <code>test</code>):</p>
  
  <pre><code>Jan 30 16:01:45 transip proftpd: PAM unable to dlopen(/lib64/security/pam_stack.so): /lib64/security/pam_stack.so: cannot open shared object file: No such file or directory
  Jan 30 16:01:45 transip proftpd: PAM adding faulty module: /lib64/security/pam_stack.so
  Jan 30 16:01:45 transip proftpd: pam_listfile(proftpd:auth): Couldn't open /etc/ftpusers
  Jan 30 16:01:45 transip proftpd[18085]: 127.0.0.1 (x.x.x.x[x.x.x.x]) - USER test (Login failed): No such user found
  </code></pre>
  
  <p><code>No such user found</code>, although it is created with Plesk. How can I fix this?</p>