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  • Critical - connecting to a b324 dedi server with an older build will disconnect all players

    Hetjax

    By Hetjax

      • Version: A21 b324
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    Summary:
    Connecting to an b324 A21 Stable server with an older build will disconnect all players.

    This bug can be used to attack other servers and constantly kick all the players.
    during this behaivor the following logs will be thrown:
    [EOS-ACS] Got message for unknown client number
    [EOS-ACS] Got action for unknown client number

    Logs:
    https://pastebin.com/zZYnmvH1

    password: vi1rLu5H3k

     

     

    Game Version: A21 b324

    OS/Version: Windows

    CPU Model: -

    System Memory: -

    GPU Model and VRAM: -

    Screen Resolution: -

    Video Settings: -

    Game mode: Dedicated server

     

    Did you wipe old saves? yes

     

    Did you start a new game? yes

     

    Did you validate your files? yes

     

    Are you using any mods? yes

     

    EAC on or off?
    on and off. i switched it off to test if it still appears because i found out that the log "Got message for unknown client number" getting thrown in the EAC implementation.
    the bug still appears with EAC on AND off.

     

    Status: NEW

     

    Bug Description:

    In addition to the description above:
    i did apply a password to my server and only gave it to the ones which send me a screenshot of their game having b324. during this phase the issue didnt appeared anymore.

     

    Detailed steps to reproduce the bug:

    I cant test it by myself because i dont have the game in an older build anymore. but im pretty sure the different build is what causes it, because the same 2 log lines from above appeared when b323 was released and players where joining with the older b317 because the server wasnt updated at that moment. after updating the server to  b323, the logs didnt appear anymore.

    1) connecting with b317 or b323 (im not sure which of them is causing it) to an b324 dedicated server

    2) the server should start throwing the 2 log lines from above multiple times

    3) players on the server getting disconnected

     

    Actual result: (description of what is occurring)

    when connecting to a server, only the version number is checked if it matches to the Server. The buildnumber isnt checked. since the version number wasnt increased during the experimental and first stable release, its possible to join to a server with an different build.

     

    Expected result: (what you expect to occur)

    the buildnumber needs to be checked when a player connects to a server to prevent issues like this in the future.

    Or at least increase the game version once to make this bug obsolete

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    Jugginator

    Something else might be going on here, especially since you said you don't get log files from the server anymore. Make sure the server is validated completely. Also, my b317/b321/b324 servers are all generating log files.

     

    I made some builds and tested the following:

     

    • Server on b317 and connected with a b317 client then a b323 client
    • Server on b317 and connected with a b317 client then a b324 client
    • Server on b324 and connected with a b324 client then a b321 client
    • Server on b324 and connected with a b324 client then a b317 client
    • I also did a couple more of these using our internal non-public builds and didn't have anyone getting kicked out

    I will bring this up with others on the team though, to see if maybe there's something missing to trigger this.

    Edited by Jugginator (see edit history)
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    Hetjax

    Hi thanks for your affort and fast response!

    I dont understand what you mean with "you said you don't get log files from the server anymore" i get logfiles all the time. maybe you missunderstood something. My server is validated completely and multiple times.

     

    since the A21 Naiwazi Gateway version came out today, this problem is obsolete for me since it only appears on vanilla hosted server. but i heared from other high pop servers which hosts vanilla, that they are running into the same issue.

    maybe this needs a certain amount of players online, or multiple players with an older build to reproduce. very hard to guess tho 😕. 

     

    did you had a b324 client connected while you joined with an b317/b321 client? it could be possible that just the b324 client will be disconnected and not the one with the wrong build.

     

    i could suggest you the following scenario:
    1. Server on b324 with an b324 client online.

    2. keep the b324 client on the server while joining with an b321 client

    3. keep the b324 client on the server while joining with an b317 client

     

    hope thats gonna help somehow :)

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    Jugginator

    "after updating the server to  b323, the logs didnt appear anymore." This is what you said above, why I thought that. A log file would be helpful though (the one you posted is locked)

     

    And yeah in every version test I had a client with that version connected. Maybe i needed more, not sure. 

    Edited by Jugginator (see edit history)
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    Hetjax

    ah, yes then you missunderstood that. I meant the both logline didnt appear anymore:
    [EOS-ACS] Got message for unknown client number
    [EOS-ACS] Got action for unknown client number

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