Retry without FAST if FAST authentication fails.

main.go

@@ -365,7 +365,24 @@ func main() {
 	// Connect to server.
 	client, err := connect(options, *flagDirectTLS)
 	if err != nil {
-		log.Fatal(err)
+		if fast.Token != "" {
+			// Reset FAST token and mechanism if FAST login failed.
+			fast.Token = ""
+			fast.Mechanism = ""
+			fast.Expiry = time.Now()
+			err := writeFastData(user, password, fast)
+			if err != nil {
+				fmt.Println(err)
+			}
+			options.FastToken = ""
+			// Try to connect to server without FAST.
+			client, err = connect(options, *flagDirectTLS)
+			if err != nil {
+				log.Fatal(err)
+			}
+		} else {
+			log.Fatal(err)
+		}
 	}
 
 	// Store fast token if a new one is received.