D55373.diff
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	diff --git a/stand/i386/pxeldr/pxeboot.8 b/stand/i386/pxeldr/pxeboot.8
	--- a/stand/i386/pxeldr/pxeboot.8
	+++ b/stand/i386/pxeldr/pxeboot.8
	@@ -130,6 +130,14 @@
	acts just like
	.Xr loader 8 .
	.Pp
	+.Nm
	+requires NFS over UDP.
	+Many recent distributions of Linux only serve NFS over TCP.
	+Enable UDP in some distributions by uncommenting
	+.Ql udp=y
	+in
	+.Pa /etc/nfs.conf .
	+.Pp
	For further information on Intel's PXE specifications and Wired for
	Management (WfM) systems, see
	.Li http://www.pix.net/software/pxeboot/archive/pxespec.pdf .
	diff --git a/stand/libsa/rpc.c b/stand/libsa/rpc.c
	--- a/stand/libsa/rpc.c
	+++ b/stand/libsa/rpc.c
	@@ -415,6 +415,11 @@
	return (-1);
	}
	port = (int)ntohl(res->port);
	+ if (port == 0) {
	+ printf("Portmapper returned 0. TCP-only NFS server?\n");
	+ free(pkt);
	+ return (-1);
	+ }
	free(pkt);

	rpc_pmap_putcache(d->destip, prog, vers, port);