File openssh-7.7p1-X_forward_with_disabled_ipv6.patch of Package openssh.17528

# HG changeset patch
# Parent  44592f09f090e74432f608084069d30d808fda69
Do not throw away already open sockets for X11 forwarding if another socket
family is not available for bind()

diff --git a/channels.c b/channels.c
index f51b7e3..95af47e 100644
--- a/channels.c
+++ b/channels.c
@@ -4637,6 +4637,13 @@ x11_create_display_inet(struct ssh *ssh, int x11_display_offset,
 				debug2("%s: bind port %d: %.100s", __func__,
 				    port, strerror(errno));
 				close(sock);
+				/* do not remove successfully opened sockets if
+				 * the request failed because the protocol
+				 * IPv4/6 is not available (e.g. IPv6 may be
+				 * disabled while being supported)
+				 */
+				if (EADDRNOTAVAIL == errno)
+					continue;
 				for (n = 0; n < num_socks; n++)
 					close(socks[n]);
 				num_socks = 0;
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