diff --git a/tcp.c b/tcp.c
index 7b3376f..72c8a94 100644
--- a/tcp.c
+++ b/tcp.c
@@ -2221,6 +2221,12 @@ void tcp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events)
 	ASSERT(!c->no_tcp);
 	ASSERT(pif_at_sidx(ref.flowside) != PIF_TAP);
 
+	if (events & EPOLLRDHUP) {
+		flow_err(conn, "EPOLLRDHUP: events=0x%x  conn->events=0x%x "
+			 "conn->flags=0x%x\n", events, conn->events,
+			 conn->flags);
+	}
+
 	if (conn->events == CLOSED)
 		return;