diff --git a/src/redirect.c b/src/redirect.c
index 498c8f6..a021874 100644
--- a/src/redirect.c
+++ b/src/redirect.c
@@ -352,6 +352,7 @@ int handleredirect(struct clientparam * param, struct ace * acentry){
 			}
 			if(param->operation == UDPASSOC){
 			    SOCKET s;
+			    if(cur->type != R_SOCKS5 && cur->type != R_SOCKS5P) return 70;
 			    s = param->remsock;
 			    param->remsock = INVALID_SOCKET;
 			    param->ctrlsocksrv = s;