OpenHands/agent-canvas
View on GitHub[Bug]: Command erroneously reports success when port 8000 is in use
Closed
#899 opened on May 28, 2026
buggood first issue
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Description
Operating System
macOS
Installation Method
npm (npx @openhands/agent-canvas or npm install -g @openhands/agent-canvas)
Agent Canvas Version
1.0.0-alpha.7
Bug Description
Server says it started successfully even though it failed
Steps to Reproduce
- start something on port 8000
- run
agent-canvas
Actual Behavior
Reports success
Expected Behavior
Either looks for a better port, or just fails
Relevant Logs
18:29:58 [ingress] Starting on port 8000...
18:29:58 [ingress] file:///Users/rbren/.npm-global/lib/node_modules/@openhands/agent-canvas/scripts/ingress.mjs:403
18:29:58 [ingress] throw err;
18:29:58 [ingress] ^
18:29:58 [ingress] Error: listen EADDRINUSE: address already in use :::8000
18:29:58 [ingress] at Server.setupListenHandle [as _listen2] (node:net:1912:16)
18:29:58 [ingress] at listenInCluster (node:net:1969:12)
18:29:58 [ingress] at Server.listen (node:net:2074:7)
18:29:58 [ingress] at startIngress (file:///Users/rbren/.npm-global/lib/node_modules/@openhands/agent-canvas/scripts/ingress.mjs:350:10)
18:29:58 [ingress] at file:///Users/rbren/.npm-global/lib/node_modules/@openhands/agent-canvas/scripts/ingress.mjs:393:1
18:29:58 [ingress] at ModuleJob.run (node:internal/modules/esm/module_job:271:25)
18:29:58 [ingress] at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:547:26)
18:29:58 [ingress] at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:116:5)
18:29:58 [ingress] Emitted 'error' event on Server instance at:
18:29:58 [ingress] at emitErrorNT (node:net:1948:8)
18:29:58 [ingress] at process.processTicksAndRejections (node:internal/process/task_queues:90:21) {
18:29:58 [ingress] code: 'EADDRINUSE',
18:29:58 [ingress] errno: -48,
18:29:58 [ingress] syscall: 'listen',
18:29:58 [ingress] address: '::',
18:29:58 [ingress] port: 8000
18:29:58 [ingress] }
18:29:58 [ingress] Node.js v22.12.0
18:29:58 [ingress] Exited with code 7
╔══════════════════════════════════════════════════════════════╗
║ Agent Canvas + Automation Stack ║
╠══════════════════════════════════════════════════════════════╣
║ ║
║ Main UI: http://localhost:8000/ ║
║ API Docs: http://localhost:8000/api/automation/docs║
║ ║
╚══════════════════════════════════════════════════════════════╝
Screenshots
No response
Additional Context
No response