SSL: CERTIFICATE_VERIFY_FAILED
Run: /Applications/Python 3.x/Install Certificates.command (macOS), or pip install certifi && update ca bundle
confidence: 40% · Python 3.x · seeded
ConnectionRefusedError: [Errno 111] Connection refused
Verify the target service is running and listening on the expected host:port. Check firewall rules.
confidence: 40% · seeded
requests.exceptions.ConnectionError: HTTPSConnectionPool: Max retries exceeded
Check network/DNS. Use requests.Session() with retry: from urllib3.util.retry import Retry; adapter = HTTPAdapter(max_retries=Retry(total=3, backoff_factor=1))
confidence: 40% · seeded
CORS error: Access-Control-Allow-Origin header missing
Add CORS headers on the server. Flask: pip install flask-cors, then CORS(app). Django: pip install django-cors-headers, add to INSTALLED_APPS and MIDDLEWARE.
confidence: 40% · seeded
TimeoutError: [Errno 110] Connection timed out
Increase timeout: requests.get(url, timeout=30). Check network connectivity. Verify DNS resolution.
confidence: 40% · seeded
flask.debughelpers.FormDataRoutingRedirect: request was redirected to add trailing slash
Add trailing slash to route: @app.route('/api/data/') or set strict_slashes=False
confidence: 40% · Flask · seeded
SyntaxError: Unexpected token '<' (expected JSON)
Server returned HTML instead of JSON (likely a 404 page or error page). Check the URL, ensure the API endpoint exists, and verify Content-Type header.
confidence: 40% · JavaScript · seeded
redis.exceptions.ConnectionError: Error connecting to localhost:6379
Redis is not running. Start it: redis-server (or brew services start redis on macOS). Check with redis-cli ping.
confidence: 40% · Redis · seeded
pg_dump: error: connection to server failed: Connection refused
PostgreSQL is not running or listening on the expected port. Start it: sudo systemctl start postgresql. Check port: pg_lscluster.
confidence: 40% · PostgreSQL · seeded
prisma error P1001: Can't reach database server
Check DATABASE_URL in .env. Verify the database is running and accepting connections. For Docker: ensure the DB container is on the same network.
confidence: 40% · Prisma · seeded
pip: WARNING: Retrying after connection broken by 'SSLError'
Corporate proxy or VPN intercepting SSL. Try: pip install --trusted-host pypi.org --trusted-host files.pythonhosted.org package
confidence: 40% · pip · seeded
Error: connect ECONNREFUSED 127.0.0.1:5432
PostgreSQL is not running locally. Start it: brew services start postgresql (macOS) or sudo systemctl start postgresql (Linux).
confidence: 40% · Node.js · seeded
Error: context deadline exceeded
HTTP request or DB query timed out. Increase timeout in context: ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
confidence: 40% · Go · seeded
PG::ConnectionBad: could not connect to server
PostgreSQL not running. Start: brew services start postgresql. Check pg_hba.conf for auth settings.
confidence: 40% · Rails/PostgreSQL · seeded
docker: Error response from daemon: driver failed programming external connectivity
Port conflict or Docker network issue. Restart Docker daemon. Check: docker network ls and prune unused networks.
confidence: 40% · Docker · seeded
Error: ErrImagePull / ImagePullBackOff
Kubernetes can't pull the image. Check image name/tag, registry auth (imagePullSecrets), and network connectivity.
confidence: 40% · Kubernetes · seeded
ERROR 2002 (HY000): Can't connect to local MySQL server through socket
MySQL not running or socket path wrong. Start: sudo systemctl start mysql. Check socket: mysqladmin variables | grep socket
confidence: 40% · MySQL · seeded
MongoNetworkError: connect ECONNREFUSED
MongoDB not running. Start: mongod --dbpath /data/db. Or check connection string (mongodb://host:port).
confidence: 40% · MongoDB · seeded
Error: DEADLINE_EXCEEDED
GCP API call timed out. Increase timeout in client options. Check if the resource exists and region is correct.
confidence: 40% · GCP · seeded
Error: rate limit exceeded (npm/pip/docker)
Too many requests to package registry. Use caching: actions/cache for npm/pip. For Docker: authenticate to increase limits.
confidence: 40% · CI/CD · seeded
ERR_SSL_PROTOCOL_ERROR
SSL/TLS handshake failed. Check certificate validity, protocol version. Server might need TLS 1.2+. Try: curl -v URL to debug.
confidence: 40% · HTTP/SSL · seeded
502 Bad Gateway
Backend server is down or not responding. Check if the upstream service is running. Review nginx/proxy error logs.
confidence: 40% · HTTP · seeded
504 Gateway Timeout
Backend took too long to respond. Increase proxy timeout. Check for slow queries or external API calls in the backend.
confidence: 40% · HTTP · seeded
ERR_CONNECTION_RESET
Server or network dropped the connection. Check server logs for crashes. May be firewall, WAF, or load balancer killing idle connections.
confidence: 40% · HTTP · seeded
net::ERR_CERT_AUTHORITY_INVALID
Self-signed or untrusted certificate. For dev: add cert to system trust store. For prod: use Let's Encrypt.
confidence: 40% · HTTP/SSL · seeded
PrismaClientInitializationError: Can't reach database server
Database not running or wrong connection string. Check DATABASE_URL in .env. Verify the DB is accepting connections.
confidence: 40% · Prisma · seeded
Cypress: cy.visit() failed trying to load
Dev server not running, or wrong base URL. Start the dev server first. Check baseUrl in cypress.config.js.
confidence: 40% · Cypress · seeded
openai.RateLimitError: Rate limit reached
Too many API requests. Add exponential backoff: time.sleep(2 ** attempt). Or upgrade to a higher tier. Use batch API for bulk.
confidence: 40% · OpenAI API · seeded
timeout: LLM API call exceeded N seconds
Model response too slow. Increase timeout. Use streaming for long responses. Consider a faster/smaller model.
confidence: 40% · LLM API · seeded
Error: Failed to query available provider packages
Terraform registry unreachable or provider name wrong. Check internet. Run: terraform init -upgrade.
confidence: 40% · Terraform · seeded
aiohttp.client_exceptions.ClientConnectorError
Can't connect to the target server. Check URL, network, DNS. For HTTPS: verify SSL certificate. Increase timeout: timeout=aiohttp.ClientTimeout(total=30).
confidence: 40% · aiohttp · seeded
httpx.ConnectError: All connection attempts failed
Target unreachable. Similar to requests but async-first. Check URL, use: async with httpx.AsyncClient() as client: ...
confidence: 40% · httpx · seeded
ClientError: An error occurred (ThrottlingException)
API rate limit hit. Add exponential backoff. Request limit increase. Use batch operations where possible.
confidence: 40% · AWS · seeded
Error: Network error: Failed to fetch (Apollo Client)
GraphQL endpoint unreachable. Check the URI in ApolloClient config. Verify CORS headers on the server.
confidence: 40% · Apollo/GraphQL · seeded
ConnectionError: ConnectionError(Connection refused) caused by: NewConnectionError
Elasticsearch not running. Start: sudo systemctl start elasticsearch. Check: curl localhost:9200.
confidence: 40% · Elasticsearch · seeded
kafka.errors.NoBrokersAvailable
Can't connect to Kafka. Check bootstrap_servers config. Verify Kafka is running: docker logs kafka. Check network/firewall.
confidence: 40% · Kafka · seeded
Sentry: Error sending event: HTTPSConnectionPool
Can't reach Sentry server. Check DSN URL. Verify network/proxy settings. For self-hosted: check Sentry service health.
confidence: 40% · Sentry · seeded
TypeError: NetworkError when attempting to fetch resource
Network request failed. Different from CORS: actual network failure. Check connectivity, URL, and ad blockers.
confidence: 40% · JavaScript/Fetch · seeded
OperationalError: SSL connection error (MySQL)
MySQL SSL config mismatch. Add: ssl_disabled=True in connection string for local dev. For prod: configure SSL certs properly.
confidence: 40% · MySQL · seeded
pymongo.errors.ServerSelectionTimeoutError
MongoDB unreachable within timeout. Check connection string. For Atlas: whitelist your IP. Check replica set name.
confidence: 40% · MongoDB · seeded
Error: context deadline exceeded (Kubernetes)
API server took too long. Check cluster health: kubectl cluster-info. Network issues or overloaded control plane.
confidence: 40% · Kubernetes · seeded
ansible: UNREACHABLE! => Failed to connect to the host via ssh
SSH connection failed. Check: ansible -m ping host. Verify SSH key, user, and host in inventory file.
confidence: 40% · Ansible · seeded
x509: certificate signed by unknown authority
TLS certificate not trusted. Add CA cert to system trust store. For dev: use InsecureSkipVerify (never in prod).
confidence: 40% · Go · seeded
ssh: connect to host github.com port 22: Connection timed out
Port 22 blocked (corporate firewall). Use HTTPS instead, or SSH over port 443: Host github.com / Hostname ssh.github.com / Port 443 in ~/.ssh/config.
confidence: 40% · git/SSH · seeded
django.db.utils.OperationalError: SSL connection has been closed unexpectedly
Database connection dropped. Add CONN_MAX_AGE=600 to DATABASES. Use django-db-connection-pool for pooling.
confidence: 40% · Django/PostgreSQL · seeded
rest_framework.exceptions.Throttled: Request was throttled
DRF rate limit hit. Increase in REST_FRAMEWORK settings: DEFAULT_THROTTLE_RATES. Or add per-view throttle_classes.
confidence: 40% · Django REST Framework · seeded
starlette.websockets.WebSocketDisconnect
WebSocket client disconnected. Handle gracefully: try/except WebSocketDisconnect in your endpoint. Clean up resources.
confidence: 40% · FastAPI/Starlette · seeded
PHP: cURL error 60: SSL certificate problem
SSL certificate not trusted. Install CA bundle: composer require guzzlehttp/guzzle. Or set CURLOPT_CAINFO to cert path.
confidence: 40% · PHP/cURL · seeded
HttpRequestException: No connection could be made
Target service unreachable. Check URL, firewall. For HTTPS: trust dev cert: dotnet dev-certs https --trust.
confidence: 40% · C#/.NET · seeded
CORS preflight request failed: No 'Access-Control-Allow-Origin' header
Server doesn't handle OPTIONS preflight. Add CORS middleware. Must respond to OPTIONS with correct headers before the actual request.
confidence: 40% · HTTP/CORS · seeded