[nv_cxr_service_start] Startup failed, streaming port is unavailable

Describe the bug
CloudXR can't start

To reproduce
Repeatedly start and stop cloudxr

Expected behavior

Observed behavior

INFO [create] Audio stream creation completed with result 0
ERROR [create] Audio capture is currently only supported on Windows platforms
 INFO [create] Creating streaming server with all configured streams
ERROR [isPortAvailableInternal] Port 49100 is already in use
ERROR [create] Port 49100 is already in use. Please check if another instance is running or set a different port via NV_CXR_SERVER_PORT environment variable.
 INFO [~Server] Uninitializing streamer logger
 INFO [create] Streaming server creation completed with result -12
ERROR [create] Server::create failed: Result::ERROR_STREAMSDK_PORT_UNAVAILABLE [/builds/cloudxr/cloudxr-openxr-runtime/src/nvidia/cxr/nv_runtime_system.cpp:400]
 INFO [createRuntimeSystem] RuntimeSystem::create completed with result: Result::ERROR_STREAMSDK_PORT_UNAVAILABLE
ERROR [createRuntimeSystem] RuntimeSystem::create failed: Result::ERROR_STREAMSDK_PORT_UNAVAILABLE [/builds/cloudxr/cloudxr-openxr-runtime/src/nvidia/cxr/nv_runtime_service.cpp:890]
 INFO [ipc_server_main_common] Server exiting: '0'
 INFO [print_end_user_failed_information]
################################################################################
#                                                                              #
#        The NVIDIA(TM) CloudXR(TM) Runtime service has failed to start.       #
#                                                                              #
# Please run the commands below and provide those logs when seeking help as it #
# will help diagnose any errors.                                               #
#                                                                              #
#     nvidia-smi 2>&1 | tee nvidia-smi.txt                                     #
#     cloudxr-service 2>&1 | tee service-logs.txt                              #
#                                                                              #
################################################################################
ERROR [nv_cxr_service_start] service->start() failed: Result::ERROR_STREAMSDK_PORT_UNAVAILABLE [/builds/cloudxr/cloudxr-openxr-runtime/src/nvidia/cxr/nv_library.cpp:380]
ERROR [nv_cxr_service_start] Startup failed, streaming port is unavailable  Check logs under /home/gear/.cloudxr/logs for details.
(venv) gear@gear-laptop-12-docker-light:~/Projects/gr00t$

Screenshots
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Platforms

• Isaac Teleop Version: [e.g. 1.0.23]
• OS: [e.g. Ubuntu X86, ARM64]
• Integrations: [e.g. Isaac Lab, Isaac Sim, ROS2]
• XR Device: [e.g. Quest 3, Pico 4 Ultra]
• Additional Devices [e.g. Manus]

Additional context
Add any other context about the problem here.

Start by reproducing repeated CloudXR service start and stop while checking the logs under /home/gear/.cloudxr/logs. Inspect the referenced nv_runtime_system.cpp, nv_runtime_service.cpp, and nv_library.cpp locations, and compare behavior with port 49100 and the NV_CXR_SERVER_PORT setting. Done means the service starts successfully without ERROR_STREAMSDK_PORT_UNAVAILABLE.