diff --git a/l2tpns.c b/l2tpns.c
index 4423df8..513e306 100644
--- a/l2tpns.c
+++ b/l2tpns.c
@@ -5074,6 +5074,11 @@ void processudp(uint8_t *buf, int len, struct sockaddr_in *addr, uint16_t indexu
 						LOG(3, s, t, "Reusing LCP negotiation\n");
 						// Start with proxy auth id to avoid client caching challenge responses
 						sess_local[s].auth_id = authid;
+						memcpy(sess_local[s].auth_chall, authchall, authchalln);
+						memcpy(sess_local[s].auth_resp, authresp, authrespn);
+						if (atype != 0) {
+						  sess_local[s].auth_type = atype;
+						}
 
 						if (!sess_local[s].lcp_authtype)
 						{