diff --git a/src/Cedar/Session.c b/src/Cedar/Session.c
index 5f2cfed8..d680a73a 100644
--- a/src/Cedar/Session.c
+++ b/src/Cedar/Session.c
@@ -1430,6 +1430,8 @@ void ClientThread(THREAD *t, void *param)
 	while (true)
 	{
 		Zero(&s->ServerIP_CacheForNextConnect, sizeof(IP));
+		Zero(s->UnderlayProtocol, sizeof(s->UnderlayProtocol));
+		Zero(s->ProtocolDetails, sizeof(s->ProtocolDetails));
 
 		if (s->Link != NULL && ((*s->Link->StopAllLinkFlag) || s->Link->Halting))
 		{