diff -u -r ppp-2.4.3/build-tree/ppp-2.4.3/pppd/sys-linux.c ppp-2.4.3-fixed/build-tree/ppp-2.4.3/pppd/sys-linux.c
--- ppp-2.4.3/build-tree/ppp-2.4.3/pppd/sys-linux.c	2005-04-29 20:08:37.000000000 +0200
+++ ppp-2.4.3-fixed/build-tree/ppp-2.4.3/pppd/sys-linux.c	2005-04-29 20:07:03.000000000 +0200
@@ -455,6 +455,13 @@
     if (new_style_driver) {
 	int flags;
 
+        /* if a ppp_fd is already open, close it first */
+        if(ppp_fd > 0) {
+          close(ppp_fd);
+          remove_fd(ppp_fd);
+          ppp_fd = -1;
+        }
+
 	/* Open an instance of /dev/ppp and connect the channel to it */
 	if (ioctl(fd, PPPIOCGCHAN, &chindex) == -1) {
 	    error("Couldn't get channel number: %m");
@@ -474,6 +481,7 @@
 	flags = fcntl(fd, F_GETFL);
 	if (flags == -1 || fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
 	    warn("Couldn't set /dev/ppp (channel) to nonblock: %m");
+	    
 	set_ppp_fd(fd);
 
 	if (!looped)