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Poseidon is a counter-measure for nProtect GameGuard (HackShield).

Original game client (with HackShield) connected to Poseidon server provides data for OpenKore connected to real game server.
The RO server sends a packet to the client, and the client must response with an appropriate packet.
Servers like cRO, kRO, jRO, twRO and vRO use GameGuard.


Poseidon works like this
1. Poseidon sets up a fake RO server (let us call it PoseidonRO).
2. RO client connects to PoseidonRO.
3. Poseidon sets up another server socket for communication with OpenKore.
4. OpenKore connects to real RO server and Poseidon.
5. Real RO server sends GameGuard query to OpenKore.
6. OpenKore sends GameGuard query to Poseidon.
7. Poseidon sends GameGuard query to RO client.
8. RO client sends a reply.
9. Poseidon sends reply to OpenKore.
10. OpenKore sends reply to real RO server.


Poseidon workflow.jpg


Poseidon server

The basic settings of the Poseidon server are in the control\poseidon.txt file:

Here you'll define the IP Address and the Port where Poseidon will keep waiting for your ragnarok online client to connect.
Here you'll define the IP Address and the Port where Poseidon will keep waiting for OpenKore to connect and send the GG/HS queries.
Here you have to specify your current server type in order to the poseidon operate properly! See src\Poseidon\servertypes.txt for available servertypes.
Enable debug messages

Ragnarok Client (Ragexe)

Use the clientinfo.xml file to connect the Ragnarok client to the Poseidon server.

You can use the following commands to start the Ragnarok client with the required parameters
  • cRO: Ragexe.exe 1rag1 /account:poseidon.xml
  • jRO client: Ragexe.exe 1rag1 -w -u:12345RO -p:be407f3a32e47d2b5cef6acb8f14724146a720cd /account:poseidon.xml
  • kRO client: Ragexe.exe 1rag1 -t:DummyToken DummyUser G Ragnarok /account:poseidon.xml
  • kRO Zero client: Ragexe.exe 1rag1 -t:DummyToken DummyUser G RagnarokZero /account:poseidon.xml
  • twRO: Ragexe.exe 1rag1
  • vRO client: Ragexe.exe 1rag1 User=DummyUser Token=DummyToken BToken=DummyBToken /account:poseidon.xml
See examples for connecting OpenKore


  1. Make sure your server connection settings have "gameGuard 1" (check tables/servers.txt).
  2. Make sure that the values of the poseidonServer and poseidonPort parameters in the control\config.txt file match to the queryserver_ip and queryserver_port values from the control\poseidon.txt file.

Launching a fake Poseidon server

There are two choices:

  1. Start start-poseidon.exe
    This application reads settings from a control\poseidon.txt file, then runs the src\Poseidon\poseidon.pl script. No Perl is required to run the script.
  2. Start src/Poseidon/poseidon.pl with parameters. You need Perl to run the script, or you can use: start.exe ! src\Poseidon\poseidon.pl
    You can use the following arguments:
    specify the location of the poseidon.txt file (default: control\poseidon.txt)
    For example: src\Poseidon\poseidon.pl --file=control\twRO\poseidon.txt
    Starts the Ragnarok Server (where the Ragnarok client will connect) at given address and port
    Starts the Query Server (where openkore client will connect) at given address and port
    Selects a server type (see src\Poseidon\servertypes.txt for available servertypes)
    Interesting for developers, poseidon will now output some extra info
    For example:
    Windows: start start.exe ! src\Poseidon\poseidon.pl --file=control\poseidon_02.txt
    Linux: src\Poseidon\poseidon.pl --server_type=twRO_2021-06-21 --ragnarokserver_ip= --ragnarokserver_port=6900
  • You can use any combination of those
  • If you provide ragnarokserver_ip, ragnarokserver_port, queryserver_ip, queryserver_port and server_type, no file will be loaded.
  • If neither file nor all the necessary command line arguments are given, poseidon will default to the default behavior of trying to load ../../control/poseidon.txt, ./control/poseidon.txt, or ./poseidon.txt -- in that order.
  • Command line arguments have priority over the configuration file. For instance, if you use --ragnarokserver_ip=<address>, the Ragnarok Server will be hosted at that address, not the one in the configuration file.
  • This feature is only available after PR #1273 (15 Oct 2017)


  • If game client protection detects OpenKore binaries, run Poseidon without binaries (install Perl) or on another (maybe virtual or WSL) machine.