diff --git a/core/src/com/unciv/logic/multiplayer/Multiplayer.kt b/core/src/com/unciv/logic/multiplayer/Multiplayer.kt
index 15f9f30be1..c058b4d145 100644
--- a/core/src/com/unciv/logic/multiplayer/Multiplayer.kt
+++ b/core/src/com/unciv/logic/multiplayer/Multiplayer.kt
@@ -1,12 +1,12 @@
 package com.unciv.logic.multiplayer
 
-import com.badlogic.gdx.Gdx
 import com.badlogic.gdx.Net
 import com.unciv.Constants
 import com.unciv.UncivGame
 import com.unciv.logic.GameInfo
 import com.unciv.logic.GameInfoPreview
 import com.unciv.logic.GameSaver
+import com.unciv.models.metadata.checkMultiplayerServerWithPort
 import com.unciv.ui.saves.Gzip
 import com.unciv.ui.worldscreen.mainmenu.OptionsPopup
 import java.util.*
@@ -24,11 +24,11 @@ interface IFileMetaData {
 
 
 
-class UncivServerFileStorage(val serverIp:String):IFileStorage {
-    val serverUrl = "http://$serverIp:8080"
+class UncivServerFileStorage(serverIpWithPort:String):IFileStorage {
+    val serverUrl = "http://$serverIpWithPort"
     override fun saveFileData(fileName: String, data: String) {
         OptionsPopup.SimpleHttp.sendRequest(Net.HttpMethods.PUT, "$serverUrl/files/$fileName", data){
-            success: Boolean, result: String -> 
+            success: Boolean, result: String ->
             if (!success) {
                 println(result)
                 throw java.lang.Exception(result)
@@ -70,7 +70,10 @@ class OnlineMultiplayer {
         val settings = UncivGame.Current.settings
         if (settings.multiplayerServer == Constants.dropboxMultiplayerServer)
             fileStorage = DropboxFileStorage()
-        else fileStorage = UncivServerFileStorage(settings.multiplayerServer)
+        else {
+            val serverIpWithPort = settings.multiplayerServer.checkMultiplayerServerWithPort()
+            fileStorage = UncivServerFileStorage(serverIpWithPort)
+        }
     }
 
     fun tryUploadGame(gameInfo: GameInfo, withPreview: Boolean) {
diff --git a/core/src/com/unciv/models/metadata/ExtensionFunctions.kt b/core/src/com/unciv/models/metadata/ExtensionFunctions.kt
new file mode 100644
index 0000000000..bcdf8bea0b
--- /dev/null
+++ b/core/src/com/unciv/models/metadata/ExtensionFunctions.kt
@@ -0,0 +1,7 @@
+package com.unciv.models.metadata
+
+/** Check the url, if no port, add [defaultPort], then return the url. */
+fun String.checkMultiplayerServerWithPort(defaultPort: Int = 8080): String {
+    return if (contains(":")) this
+    else "$this:$defaultPort"
+}
\ No newline at end of file
diff --git a/core/src/com/unciv/ui/worldscreen/mainmenu/OptionsPopup.kt b/core/src/com/unciv/ui/worldscreen/mainmenu/OptionsPopup.kt
index 86d9892eed..5d9b9218df 100644
--- a/core/src/com/unciv/ui/worldscreen/mainmenu/OptionsPopup.kt
+++ b/core/src/com/unciv/ui/worldscreen/mainmenu/OptionsPopup.kt
@@ -16,6 +16,7 @@ import com.unciv.UncivGame
 import com.unciv.logic.MapSaver
 import com.unciv.logic.civilization.PlayerType
 import com.unciv.models.UncivSound
+import com.unciv.models.metadata.checkMultiplayerServerWithPort
 import com.unciv.models.ruleset.Ruleset
 import com.unciv.models.ruleset.Ruleset.RulesetError
 import com.unciv.models.ruleset.Ruleset.RulesetErrorSeverity
@@ -342,9 +343,9 @@ class OptionsPopup(val previousScreen: BaseScreen) : Popup(previousScreen) {
         }
 
     }
-
-    private fun successfullyConnectedToServer(action: (Boolean, String)->Unit){
-        SimpleHttp.sendGetRequest( "http://"+ settings.multiplayerServer+":8080/isalive", action)
+    
+    fun successfullyConnectedToServer(action: (Boolean, String)->Unit){
+        SimpleHttp.sendGetRequest("http://${settings.multiplayerServer.checkMultiplayerServerWithPort()}/isalive", action)
     }
 
     private fun getAdvancedTab() = Table(BaseScreen.skin).apply {
diff --git a/desktop/src/com/unciv/app/desktop/UncivServer.kt b/desktop/src/com/unciv/app/desktop/UncivServer.kt
index 36dffcc64d..892aad0672 100644
--- a/desktop/src/com/unciv/app/desktop/UncivServer.kt
+++ b/desktop/src/com/unciv/app/desktop/UncivServer.kt
@@ -12,12 +12,25 @@ import java.io.File
 
 
 internal object UncivServer {
+    private var serverPort = 8080
+
     @JvmStatic
-    fun main(arg: Array<String>) {
+    fun main(args: Array<String>) {
+        args.forEach { arg ->
+            when {
+                arg.startsWith("-port=") -> with(arg.removePrefix("-port=").toIntOrNull() ?: 0) {
+                    if (this in 1024..49151) serverPort = this
+                    else println("'port' must be between 1024 and 49151")
+                }
+            }
+        }
+
+        println("Server will run on $serverPort port, you can use '-port=XXXX' custom port.")
+
         val fileFolderName = "MultiplayerFiles"
         File(fileFolderName).mkdir()
         println(File(fileFolderName).absolutePath)
-        embeddedServer(Netty, port = 8080) {
+        embeddedServer(Netty, port = serverPort) {
             routing {
                 get("/isalive") {
                     call.respondText("true")