diff -up tightvnc-1.5.0-20081015svn3022/unix/vncserver.rh212985 tightvnc-1.5.0-20081015svn3022/unix/vncserver
--- tightvnc-1.5.0-20081015svn3022/unix/vncserver.rh212985	2008-10-23 13:03:57.000000000 +0200
+++ tightvnc-1.5.0-20081015svn3022/unix/vncserver	2008-10-23 13:05:21.000000000 +0200
@@ -161,11 +161,25 @@ $cmd .= " >> " . &quotedString($desktopL
 # Run $cmd and record the process ID.
 
 $pidFile = "$vncUserDir/$host:$displayNumber.pid";
-system("$cmd & echo \$! >$pidFile");
+system(
+"rm -f $pidFile
+ $cmd &
+ PID_TEMP=\$!
+ PID_NUM=\$PID_TEMP
+
+ # Give Xvnc a chance to start up
+
+ sleep 3;
+
+ if ps -p \$PID_NUM -o comm= | grep -q Xvnc; then
+     echo \$PID_NUM > $pidFile
+ fi"
+);
 
-# Give Xvnc a chance to start up
-
-sleep(3); 
+if (!(-e "$pidFile")) {
+    warn "Unable to start Xvnc, exiting\n";
+    exit 2;
+}
 
 warn "\nNew '$desktopName' desktop is $host:$displayNumber\n\n";