How to fix the Cursor Provider Error that lasts for days
Most persistent Cursor Provider Errors aren't a network problem — they're caused by a conflicting MCP server. Here's the fix sequence that actually works.
Topic
Troubleshooting
Error-fixing (combine with How To)
How to fix the Cursor Connection Error when the agent stops working
The same 'Connection failed' error hides four different causes. Here's how to diagnose which one is hitting you and apply the right fix.
How to fix n8n nested loops: the inner loop retains completed state bug
The inner Loop Over Items node skips processing after the first outer iteration because it retains its completed state. Here are the three fixes, including the Done-branch chain pattern that avoids the bug entirely.
Make scenario won't trigger: 7-step webhook diagnosis
Seven sequential checks to diagnose a Make scenario that won't run: covers webhooks, polling triggers, incomplete executions queue, scheduling, and timezone issues.
How to fix n8n OAuth callback URL returning 401
Three causes of the n8n OAuth callback 401 and the exact fixes: WEBHOOK_URL mismatch, stale credentials after a domain change, and X (Twitter) OAuth1/OAuth2 endpoint confusion.
Cursor: fix 'Waiting for extension host' hang
The 'Waiting for extension host' hang blocks Cursor's AI agent and extensions. Four fixes in order of effort: restart the host, disable extensions, wipe the state database, or update Cursor.
n8n Loop node only processes the first item: how to fix it
The Loop Over Items node only processes one batch when processing nodes aren't wired back to its input. Here's the exact fix, plus the Merge node pattern for conditional branches.
How to fix n8n webhook not firing (test URL vs production URL gotcha)
n8n has two webhook URLs: test (/webhook-test/) and production (/webhook/). Using the wrong one for your mode causes silent failures. Here is how to check which URL your integration is calling and how to fix it.
How to fix n8n webhook returning 403 instead of 401 for invalid Basic Auth
n8n returns 403 Forbidden (not 401) when Basic Auth credentials are wrong - breaking browser re-challenge flows. Three workarounds: nginx proxy, Header Auth, or the pending patch in PR #26402.
How to Clear the Cursor Cache: Fix Stuck or Laggy AI
Stuck indexing, frozen chat, dead autocomplete? Clear Cursor's cache - the soft in-app reset first, then the on-disk folders, with the exact paths per OS.