Taken from https://github.com/yrutschle/sslh/pull/310.

Index: test.cfg
--- test.cfg.orig
+++ test.cfg
@@ -18,7 +18,7 @@ listen:
 (
     { host: "localhost"; port: "8080"; keepalive: true; },
     { host: "localhost"; port: "8081"; keepalive: true; },
-    { host: "ip4-localhost"; is_udp: true; port: "8086"; }
+    { host: "127.0.0.1"; is_udp: true; port: "8086"; }
 );
 
  
@@ -32,7 +32,7 @@ protocols:
      { name: "xmpp";  host: "localhost"; port: "9009"; },
      { name: "adb";  host: "localhost"; port: "9010"; },
      { name: "syslog"; host: "localhost"; port: "9013"; },
-     { name: "regex"; host: "ip4-localhost"; is_udp: true; port: "9020";
+     { name: "ssh"; host: "127.0.0.1"; is_udp: true; port: "9020";
          udp_timeout: 30;
          regex_patterns: [ "^foo" ];
      },