service: fix win build service not listening for TCP/IPv4 conns

CHANGELOG.md

@@ -16,9 +16,10 @@
 * Fixed compilation error (missing include directive) when building without S3 support.
 * Fixed check for file slice smaller than block size in situations without direct IO.
 * Fixed missing random IO flag in config file example.
+* Fixed Windows build not listening for TCP/IPv4 connections in service mode. 
 
 ### Contributors
-* Thanks to Glenn K. Lockwood and Avi Drabkin for reporting an issues. Thanks to Jan Heichler, Rob Mallory, Maria Gutierrez for helpful comments and suggestions.
+* Thanks to Glenn K. Lockwood, Avi Drabkin, Michael Bertelson for reporting an issues. Thanks to Jan Heichler, Rob Mallory, Maria Gutierrez for helpful comments and suggestions.
 
 ## v2.3.1 (Apr 10, 2023)
 

source/HTTPServiceSWS.cpp

@@ -38,6 +38,11 @@ void HTTPServiceSWS::startServer()
 
 	defineServerResources(server);
 
+#ifdef CYGWIN_SUPPORT
+	/* SWS defaults to listening for IPv6, which implies also IPv4 on linux, but is interpreted
+		as really only IPv6 and no IPv4 on cygwin, so rather force it to IPv4 only on cygwin. */
+	server.config.address = "0.0.0.0";
+#endif
 	server.config.port = progArgs.getServicePort(); // desired port (std::promise confirms this)
 	std::promise<unsigned short> actualServerPort; // set by HttpServer after startup (0 for error)