# Px4\_sitl\_default gazebo hanging on simulator connection to TCP port 4560 **URL:** \ **Category:** PX4 Autopilot\ **Created:** [January 27, 2021, 4:37am UTC](https://discuss.px4.io/t/px4-sitl-default-gazebo-hanging-on-simulator-connection-to-tcp-port-4560/20718 "2021-01-27T04:37:06Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![betaBison](https://discuss.px4.io/user_avatar/discuss.px4.io/betabison/32/7969_2.png) [@betaBison](https://discuss.px4.io/u/betaBison)\ **Post date:** [January 27, 2021, 4:37am UTC](https://discuss.px4.io/t/px4-sitl-default-gazebo-hanging-on-simulator-connection-to-tcp-port-4560/20718/1 "2021-01-27T04:37:06Z")
I’m trying to run sitl on a Jetson TX2. When I run “make px4\_sitl\_default gazebo” it builds find but seem to hang on “Waiting for simulator to accept connection on TCP port 4560”. I have the same code working on a desktop computer, so I can see what the finished output is supposed to be, but I haven’t been able to figure out the difference on the Jetson TX2. Stepping through the code, I found that it never exits out of [this while loop](https://github.com/PX4/PX4-Autopilot/blob/master/src/modules/simulator/simulator_mavlink.cpp#L721). OS: Ubuntu 18.04 Gazebo: 9.0.0 PX4-Autopilot: latest master branch submodules: recently updated recursively Hardware: Jetson TX2 Thank you! ```auto user:PX4-Autopilot$ make px4_sitl_default gazebo [0/4] Performing build step for 'sitl_gazebo' ninja: no work to do. [3/4] cd /home/user/catkin_ws/src/PX4-Autopilot/build/px.../user/catkin_ws/src/PX4-Autopilot/build/px4_sitl_default SITL ARGS sitl_bin: /home/user/catkin_ws/src/PX4-Autopilot/build/px4_sitl_default/bin/px4 debugger: none program: gazebo model: none world: none src_path: /home/user/catkin_ws/src/PX4-Autopilot build_path: /home/user/catkin_ws/src/PX4-Autopilot/build/px4_sitl_default empty model, setting iris as default GAZEBO_PLUGIN_PATH :/home/user/catkin_ws/src/PX4-Autopilot/build/px4_sitl_default/build_gazebo GAZEBO_MODEL_PATH :/home/user/catkin_ws/src/PX4-Autopilot/Tools/sitl_gazebo/models LD_LIBRARY_PATH /home/user/catkin_ws/devel/lib:/opt/ros/melodic/lib:/home/user/catkin_ws/src/PX4-Autopilot/build/px4_sitl_default/build_gazebo empty world, setting empty.world as default Using: /home/user/catkin_ws/src/PX4-Autopilot/Tools/sitl_gazebo/models/iris/iris.sdf SITL COMMAND: "/home/user/catkin_ws/src/PX4-Autopilot/build/px4_sitl_default/bin/px4" "/home/user/catkin_ws/src/PX4-Autopilot/build/px4_sitl_default"/etc -s etc/init.d-posix/rcS -t "/home/user/catkin_ws/src/PX4-Autopilot"/test_data INFO [px4] Creating symlink /home/user/catkin_ws/src/PX4-Autopilot/build/px4_sitl_default/etc -> /home/user/catkin_ws/src/PX4-Autopilot/build/px4_sitl_default/tmp/rootfs/etc ________ _____ | ___ \ \ \ / / / | | |_/ / \ V / / /| | | __/ / \ / /_| | | | / /^\ \ \___ | \_| \/ \/ |_/ px4 starting. INFO [px4] Calling startup script: /bin/sh etc/init.d-posix/rcS 0 Info: found model autostart file as SYS_AUTOSTART=10016 INFO [param] selected parameter default file eeprom/parameters_10016 [param] parameter file not found, creating eeprom/parameters_10016 SYS_AUTOCONFIG: curr: 0 -> new: 1 SYS_AUTOSTART: curr: 0 -> new: 10016 BAT_N_CELLS: curr: 0 -> new: 4 CAL_ACC0_ID: curr: 0 -> new: 1310988 CAL_ACC1_ID: curr: 0 -> new: 1310996 CAL_ACC2_ID: curr: 0 -> new: 1311004 CAL_GYRO0_ID: curr: 0 -> new: 1310988 CAL_GYRO1_ID: curr: 0 -> new: 1310996 CAL_GYRO2_ID: curr: 0 -> new: 1311004 CAL_MAG0_ID: curr: 0 -> new: 197388 CAL_MAG1_ID: curr: 0 -> new: 197644 CBRK_SUPPLY_CHK: curr: 0 -> new: 894281 COM_RC_IN_MODE: curr: 0 -> new: 1 EKF2_REQ_GPS_H: curr: 10.0000 -> new: 0.5000 EKF2_MULTI_IMU: curr: 0 -> new: 3 SENS_IMU_MODE: curr: 1 -> new: 0 EKF2_MULTI_MAG: curr: 0 -> new: 2 SENS_MAG_MODE: curr: 1 -> new: 0 SDLOG_MODE: curr: 0 -> new: 1 SDLOG_PROFILE: curr: 1 -> new: 131 SDLOG_DIRS_MAX: curr: 0 -> new: 7 SENS_BOARD_X_OFF: curr: 0.0000 -> new: 0.0000 SENS_DPRES_OFF: curr: 0.0000 -> new: 0.0010 TRIG_INTERFACE: curr: 4 -> new: 3 COM_CPU_MAX: curr: 90.0000 -> new: -1.0000 IMU_INTEG_RATE: curr: 200 -> new: 250 NAV_ACC_RAD: curr: 10.0000 -> new: 2.0000 RTL_RETURN_ALT: curr: 60.0000 -> new: 30.0000 RTL_DESCEND_ALT: curr: 30.0000 -> new: 10.0000 PWM_MAX: curr: 2000 -> new: 1950 PWM_MIN: curr: 1000 -> new: 1075 GPS_UBX_DYNMODEL: curr: 7 -> new: 6 * SYS_AUTOCONFIG: curr: 1 -> new: 0 INFO [dataman] Unknown restart, data manager file './dataman' size is 11798680 bytes INFO [simulator] Waiting for simulator to accept connection on TCP port 4560 Gazebo multi-robot simulator, version 9.0.0 Copyright (C) 2012 Open Source Robotics Foundation. Released under the Apache 2 License. http://gazebosim.org [Msg] Waiting for master. [Msg] Connected to gazebo master @ http://127.0.0.1:11345 [Msg] Publicized address: 10.34.197.122 [Err] [ModelDatabase.cc:390] Unable to parse model.config for model[http://gazebosim.org/models/bin_4_dropping_task] ``` ---
**Author:** ![yigitto](https://discuss.px4.io/letter_avatar_proxy/v4/letter/y/5fc32e/32.png) [@yigitto](https://discuss.px4.io/u/yigitto)\ **Post date:** [January 31, 2021, 5:46pm UTC](https://discuss.px4.io/t/px4-sitl-default-gazebo-hanging-on-simulator-connection-to-tcp-port-4560/20718/2 "2021-01-31T17:46:31Z")
Hi betaBison, I have the same problem. Did u solve it? ---
**Author:** ![betaBison](https://discuss.px4.io/user_avatar/discuss.px4.io/betabison/32/7969_2.png) [@betaBison](https://discuss.px4.io/u/betaBison)\ **Post date:** [January 31, 2021, 6:03pm UTC](https://discuss.px4.io/t/px4-sitl-default-gazebo-hanging-on-simulator-connection-to-tcp-port-4560/20718/3 "2021-01-31T18:03:20Z")
@yigitto It seems to be an issue running on Jetson hardware. I got it working after following the steps in [this similar post](https://discuss.px4.io/t/nvidia-jetson-xavier-agx-controlling-px4-pixhawk-ros-mavros/16135/17) to have the simulator connect via udp. Best of luck