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Diagnostics

These articles describe how to log data, troubleshoot problems, and tune performance.

Common errors
 

These articles describe common errors you may encounter when setting up and configuring Fastly services.

  • Common 400 errors on Fastly
  • Common 503 errors on Fastly
  • Common OTFP errors
  • Common service and domain errors
  • Error 1000 with CloudFlare DNS
  • Fixing cross-domain errors
  • Loop detection
  • TLS certificate errors
  • TLS origin configuration messages
Debugging techniques
 

Because Fastly doesn't store customer logs, we provide information about debugging techniques that help you gain insights into your service configurations.

  • Changing connection timeouts to your origin
  • Checking cache
  • Debugging with mtr
  • Debugging with WebPageTest
  • Fastly's service status
  • Google Pagespeed module errors
  • Googlebot crawl stats
  • Temporarily disabling caching
  • Using GET instead of HEAD for command line caching tests
Streaming logs
 

These articles describe how we support real-time log streaming of data that passes through Fastly.

  • About Fastly's real-time log streaming features
  • Changing log compression formats
  • Changing log line formats
  • Changing log placement
  • Changing where log files are written
  • Configuring Google IAM service account impersonation to avoid storing keys on Fastly logging
  • Creating an AWS IAM role for Fastly logging
  • Custom log formats
  • Encrypting logs
  • Setting up remote log streaming
  • Useful conditions for logging
  • Useful log formats
  • Useful variables to log
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