D8552.1775157197.diff
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	Index: head/sys/netinet/tcp_syncache.c
	===================================================================
	--- head/sys/netinet/tcp_syncache.c
	+++ head/sys/netinet/tcp_syncache.c
	@@ -1069,10 +1069,17 @@
	}

	/*
	- * If timestamps were negotiated the reflected timestamp
	- * must be equal to what we actually sent in the SYN\|ACK.
	+ * If timestamps were negotiated, the reflected timestamp
	+ * must be equal to what we actually sent in the SYN\|ACK
	+ * except in the case of 0. Some boxes are known for sending
	+ * broken timestamp replies during the 3whs (and potentially
	+ * during the connection also).
	+ *
	+ * Accept the final ACK of 3whs with reflected timestamp of 0
	+ * instead of sending a RST and deleting the syncache entry.
	*/
	- if ((to->to_flags & TOF_TS) && to->to_tsecr != sc->sc_ts) {
	+ if ((to->to_flags & TOF_TS) && to->to_tsecr &&
	+ to->to_tsecr != sc->sc_ts) {
	if ((s = tcp_log_addrs(inc, th, NULL, NULL)))
	log(LOG_DEBUG, "%s; %s: TSECR %u != TS %u, "
	"segment rejected\n",