Don't use this method, it's just a bag of bugs, use System.Management (WMI)
instead.

Following snip illustrates how you can get the Processes SessionId from a
remote server:
Check MSDN for more detail on WMI's Win32_Process class.
...
 ConnectionOptions co = new ConnectionOptions();;
 co.Username = "administrator"; //any account with appropriate privileges
 co.Password = "pppppp";
 string remMachine = "machineName";
 ManagementScope scope = new ManagementScope(@"\\" + remMachine +
@"\root\cimv2", co);
       SelectQuery selectQuery = new SelectQuery("Select Name, SessionId
from Win32_Process");
       using(ManagementObjectSearcher searcher =
           new ManagementObjectSearcher(scope, selectQuery))
       {
           foreach (ManagementObject proc in searcher.Get())
               Console.WriteLine("{0}, {1}",proc["Name"].ToString(),
proc["SessionId"].ToString());
       }

Willy.