Fix #5984: Allow socket binding to same port after crash

distribution/changelog.txt

@@ -13,6 +13,7 @@
 - Fix: [#5920] Placing guest spawn doesn't do anything every 3rd click
 - Fix: [#5939] Crash when importing 'Six Flags Santa Fe'.
 - Fix: [#5977] Custom music files not showing up in music list
+- Fix: [#5984] Allow socket binding to same port after crash
 - Improved: [#4301] Leading and trailing whitespace in player name is now removed.
 - Improved: [#5859] OpenGL rendering performance
 - Improved: [#5863] Switching drawing engines no longer requires the application to restart.

src/openrct2/network/TcpSocket.cpp

@@ -147,6 +147,12 @@ public:
             log_error("IPV6_V6ONLY failed. %d", LAST_SOCKET_ERROR());
         }
 
+        value = 1;
+        if (setsockopt(_socket, SOL_SOCKET, SO_REUSEADDR, (const char*)&value, sizeof(value)) != 0)
+        {
+            log_error("SO_REUSEADDR failed. %d", LAST_SOCKET_ERROR());
+        }
+
         try
         {
             // Bind to address:port and listen