has to be a global command

proftpd/proftpd.conf

@@ -25,7 +25,6 @@ AllowOverwrite        on
 MaxLoginAttempts      2
 RequireValidShell     yes
 LsDefaultOptions      "-l"
-WTmpLog               off
 
 TimeoutLogin          120
 TimeoutNoTransfer     600
@@ -47,6 +46,7 @@ SystemLog             @l_prefix@/var/proftpd/proftpd.system.log
     DisplayLogin      @l_prefix@/etc/proftpd/proftpd.msg.login
     DisplayFirstChdir .message
     DisplayReadme     README*
+    WTmpLog           off
 </Global>
 
 <Directory /*>