diff -ur pvfs-kernel-1.6.3-pre1-linux-2.4/libkpvfs/klib/mgrcomm.c pvfs-kernel-1.6.3-pre1-linux-2.4-fix/libkpvfs/klib/mgrcomm.c
--- pvfs-kernel-1.6.3-pre1-linux-2.4/libkpvfs/klib/mgrcomm.c	Tue Jun  8 16:03:46 2004
+++ pvfs-kernel-1.6.3-pre1-linux-2.4-fix/libkpvfs/klib/mgrcomm.c	Tue Jun  8 16:15:00 2004
@@ -205,6 +205,15 @@
 		if (!newconn) badmgrfd(fd);
 		return(-EIO);
 	}
+
+	if (ack_p->eno > 1000) /* serious error -- errno's > 1000 will be interpreted as a pointer upstream - must be garbage on manager anyway */
+	{
+		PERROR("The PVFS Manager returned an unreasonable errno [%d] on reqest type [%d] for data [%s].  Something must be wrong here.\n", ack_p->eno, req_p->type, data_p == NULL ? "NONE" : data_p);
+		Close(fd);
+		if (!newconn) badmgrfd(fd);
+		return(-EIO);
+	}
+
 	/* not going to close connection, must save the state! */
 	if (newconn) {
 		err = addmgrinfo(saddr_p, fd);