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Frontend url does not work for participant with whom the session is shared #5312

@musukwamoshi

Description

@musukwamoshi

Type: Bug

Setup a simple react/vite frontend and node backend project using ports 3000 for the frontend and port 3001 for the nodejs backend
The project structure has the frontend and backend in different folders
Provide a liveshare link to another user
When the user clicks the link give them read write permissions to the terminal
Share the backend and frontend server
Expected Result: It is expected that the participant of the session should be able to access both servers e.g localhost:3000/ for frontend and localhost:3001 for backend
Actual result: Participant can only access the backend server at localhost:3001 but cannot load the frontend application on their end

Extension version: 1.0.5959
VS Code version: Code 1.107.1 (994fd12f8d3a5aa16f17d42c041e5809167e845a, 2025-12-17T14:15:14.850Z)
OS version: Windows_NT x64 10.0.26100
Modes:

System Info
Item Value
CPUs AMD Ryzen 7 5800H with Radeon Graphics (16 x 3194)
GPU Status 2d_canvas: enabled
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
skia_graphite: disabled_off
trees_in_viz: disabled_off
video_decode: enabled
video_encode: enabled
webgl: enabled
webgl2: enabled
webgpu: enabled
webnn: disabled_off
Load (avg) undefined
Memory (System) 27.86GB (10.24GB free)
Process Argv --crash-reporter-id 814dc77d-8aee-4192-9915-034ce0a25d91
Screen Reader no
VM 67%
A/B Experiments
vsliv368cf:30146710
pythonvspyt551:31249599
binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
6518g693:31436602
aj953862:31281341
nes-set-on:31351930
6abeh943:31336334
envsactivate1:31353494
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3efgi100_wstrepl:31403338
use-responses-api:31390855
je187915:31401257
afag3459:31428711
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terminalsuggestenabled:31431119
cmp-ext-treat:31426748
cp_cls_c_966_ss:31435507
copilot6169-t2000-control:31440805
inlinechat_v2_hd992725:31437219
c0683394:31419495
478ah919:31426797
ge8j1254_inline_auto_hint_haiku:31431912
a5gib710:31434435
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request_with_suggest:31435827
rename_enabled:31436409
7a04d226_do_not_restore_last_panel_session:31438103
anthropic_thinking_t:31432745
cp_cls_c_1081:31433293
copilot-nes-oct-trt:31432596
nes-slash-models-off:31440959

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