# Maintaining Client-Server Version Numbers **URL:** \ **Category:** Multiplayer & Networking\ **Tags:** Networking, client, Server, dedicated, unreal-engine, version, question\ **Created:** [March 18, 2017, 6:48am UTC](https://forums.unrealengine.com/t/maintaining-client-server-version-numbers/388287 "2017-03-18T06:48:53Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![TheMainStark](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/themainstark/32/1120943_2.png) [@TheMainStark](https://forums.unrealengine.com/u/TheMainStark)\ **Post date:** [March 18, 2017, 6:48am UTC](https://forums.unrealengine.com/t/maintaining-client-server-version-numbers/388287/1 "2017-03-18T06:48:53Z")
I am having trouble understanding how to properly develop separate Client and Server versions of a project. I know they need to be built by the same source - which to my knowledge has been done. My issue is that I will have some client blueprints or settings that will differ from the dedicated server. To name one, UI and login setup. Perhaps I just have the wrong theoretical process to do this? I have: - Installed 4.15 Source - Created two separate projects, near identical ThirdPerson blueprint maps. Named one project Client and the other project Server. I have placed them in the source directory so they both show up in the visual basics Solution Explorer. - Followed through a tutorial to use UnrealFrontEnd to create a dedicate server for the ‘Server’ Project. - Once all changes are made in UE4, I re-build the solution for the whole engine in Visual Basics. Than build solutions for each project individually. (I’ve also tried just re-building just the whole engine). Some success: - Since the ‘Server’ project has been packaged for both a client and dedicated server… I can open the dedicated server than use the “WindowsNoEditor” version to connect to the dedicated server. I can connect multiple windows and see every character moving around fine, so the dedicated server appears to be working properly. I have this quote from one post that may be what I need or what I am looking for but I am predominantly a blueprint developer. What is the process to do this in as C++ task? > _**You can handle the version checks on > your own binding the > IsNetworkCompatibleOverride delegate > of FNetworkVersion to you own handler. > You can also bind the > GetLocalNetworkVersionOverride > delegate of FNetworkVersion to use > your own version system, for instance > a simple int so that different version > can connect together.**_ The image below is my error when trying to connect my ‘Client’ project to my ‘Server’ dedicated server. (I hope that doesnt sound confusing): ![130648-capture.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/a/5/2/a52463a0b0cbb0bc411e845b6a0150d31d18c3be.png) ---
**Author:** ![Socke81](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/socke81/32/1194535_2.png) [@Socke81](https://forums.unrealengine.com/u/Socke81)\ **Post date:** [May 21, 2017, 10:17pm UTC](https://forums.unrealengine.com/t/maintaining-client-server-version-numbers/388287/2 "2017-05-21T22:17:49Z")
Create a C++ Class from Editor (Blueprint Library). ``` #pragma once #include "Kismet/BlueprintFunctionLibrary.h" #include "NetworkVersion.h" #include "MyGameBluePrintLib.generated.h" /** * */ UCLASS() class MYGAME_API UMyGameBluePrintLib : public UBlueprintFunctionLibrary { GENERATED_BODY() public: UMyGameBluePrintLib(); private: /* Client can't connect to Server if this Number not fit. */ uint32 getServerClientSyncVersion(); }; ``` ``` #include "MyGame.h" #include "MyGameBluePrintLib.h" UMyGameBluePrintLib::UMyGameBluePrintLib() { FNetworkVersion::GetLocalNetworkVersionOverride.BindUObject(this, &UMyGameBluePrintLib::getServerClientSyncVersion); } uint32 UMyGameBluePrintLib::getServerClientSyncVersion() { return 123456; } ``` ---
**Author:** ![TheMainStark](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/themainstark/32/1120943_2.png) [@TheMainStark](https://forums.unrealengine.com/u/TheMainStark)\ **Post date:** [May 22, 2017, 6:53pm UTC](https://forums.unrealengine.com/t/maintaining-client-server-version-numbers/388287/3 "2017-05-22T18:53:27Z")
Thanks a ton for this!!! I tried briefly yesterday night but I couldnt get it to work. I am going to re-try tonight I may have modified some of my NetworkVersion files that are causing problems. Does it matter what type of C++ class I make? I made a blank class but thinking about it now I should have done a blueprint class… I think? ---
**Author:** ![TheMainStark](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/themainstark/32/1120943_2.png) [@TheMainStark](https://forums.unrealengine.com/u/TheMainStark)\ **Post date:** [May 23, 2017, 8:25am UTC](https://forums.unrealengine.com/t/maintaining-client-server-version-numbers/388287/4 "2017-05-23T08:25:36Z")
With a fresh source install and correctly choosing the C++ Class as a Blueprint Library Function it worked like a charm. Exactly what I was looking for! Thank You! ---
**Author:** ![anonymous\_user\_089a4978](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_089a4978](https://forums.unrealengine.com/u/anonymous_user_089a4978)\ **Post date:** [September 30, 2018, 11:29am UTC](https://forums.unrealengine.com/t/maintaining-client-server-version-numbers/388287/5 "2018-09-30T11:29:31Z")
Thank you very much Socke81! This saved me from compiling the whole engine just to fix version mismatch error. ---
**Author:** ![mightyenigma](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@mightyenigma](https://forums.unrealengine.com/u/mightyenigma)\ **Post date:** [October 1, 2018, 5:43pm UTC](https://forums.unrealengine.com/t/maintaining-client-server-version-numbers/388287/6 "2018-10-01T17:43:32Z")
Hey everyone, this sounds like the problem I am having but I don’t know for sure. How do I tell if it’s the version number or something else which gives me the Session Not Found error when trying to connect my slightly-different version of the game for Android with the original version for PC (this worked in the past by the way, when they had the same project file. I had to separate them out because Android doesn’t support one of the non-essential plugins I used for some fun menu effects). Here’s my post if any of you would be willing to look at it and give me a clue: > **[Can I have two different games join the same session?](https://forums.unrealengine.com/questions/832014/can-i-have-two-different-games-join-the-same-sessi.html)** > > I have a game that used to work well with running the Android build of it (client) and joining a PC build of the same game (host). But now I can't build the game to Android, because I am using a plugin that can't work on Android (because of some Kiss... ---
**Author:** ![mightyenigma](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@mightyenigma](https://forums.unrealengine.com/u/mightyenigma)\ **Post date:** [October 1, 2018, 5:46pm UTC](https://forums.unrealengine.com/t/maintaining-client-server-version-numbers/388287/7 "2018-10-01T17:46:47Z")
Nevermind it works! I just had to shut down my VPN I didn’t realize I had left running! ---
**Author:** ![anonymous\_user\_5f3cf05a](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_5f3cf05a](https://forums.unrealengine.com/u/anonymous_user_5f3cf05a)\ **Post date:** [May 26, 2020, 1:55pm UTC](https://forums.unrealengine.com/t/maintaining-client-server-version-numbers/388287/8 "2020-05-26T13:55:27Z")
Hi Sorry for my silly question. I have a same problem like you. And trying to solve with this code. So what do I need to do with this code? Do I need to call from my blueprint gamemode or something? Or this code already running from start like a “beginplay”? ---
**Author:** ![Socke81](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/socke81/32/1194535_2.png) [@Socke81](https://forums.unrealengine.com/u/Socke81)\ **Post date:** [May 26, 2020, 2:14pm UTC](https://forums.unrealengine.com/t/maintaining-client-server-version-numbers/388287/9 "2020-05-26T14:14:26Z")
If the code still works (is three years old) then the version check in the engine is overwritten. When the engine makes a request, it does not use the normal one but the one from the code example. So always the version 123456. ---
**Author:** ![anonymous\_user\_5f3cf05a](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_5f3cf05a](https://forums.unrealengine.com/u/anonymous_user_5f3cf05a)\ **Post date:** [May 26, 2020, 7:55pm UTC](https://forums.unrealengine.com/t/maintaining-client-server-version-numbers/388287/10 "2020-05-26T19:55:50Z")
Hi TheMainShark , Sorry for my silly question, what did u do with that cpp code after this? did u call it in blueprint? or just leave it there, it will running automatically like begin play.