Takeshi uses its own encryption key, so the official Tibia client cannot connect. Use OTClient with the Tibia 7.72 data files.

Server	ot.delincel.nl:7171
Client version	7.72

1. Place Tibia.dat and Tibia.spr of version 7.72 in data/things/772/.
2. Open modules/gamelib/const.lua and replace the value of OTSERV_RSA with the public key below.
3. Open modules/client_entergame/entergame.lua and add g_game.setCustomOs(2) just above g_game.chooseRsa.
4. Start OTClient, enter your account number and password, set the server to ot.delincel.nl:7171 and the version to 7.72.

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Public key

142996239624163995200701773828988955507954033454661532174705160829347375827760388829672133862046006741453928458538592179906264509724520840657286865659265687630979195970404721891201847792002125535401292779123937207447574596692788513647179235335529307251350570728407373705564708871762033017096809910315212883967

Exponent: 65537