Since the update to n8n Cloud version 2.0.3, MySQL nodes using SSH tunnels exhibit a connection pool leak causing intermittent failures:
Behavior:
First workflow execution: 
Works fine
Multiple executions in sequence: 
Fail with “Channel open failure”
After waiting 5-10 minutes: Works again
Error: (SSH) Channel open failure: open failed
at onChannelOpenFailure (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/[email protected]/node_modules/ssh2/lib/utils.js:16:11)
at CHANNEL_OPEN_FAILURE (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/[email protected]/node_modules/ssh2/lib/client.js:572:11)
Environment:
- n8n Version: 2.0.3 (Cloud)