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After installing the mitmproxy CA certificate in a client system, you get an error in the client application stating that the website certificate is invalid.  Depending on the browser used, the errors may include:

  • The certificate is not trusted because the issuer certificate has expired.
  • This certificate has expired or is not yet valid


When CERT Tapioca restarts the mitmproxy capture via, the .mitmproxy directory is copied from a static copy provided by Tapioca. This CA certificate expired on July 10, 2016 for CERT Tapioca 1.0.


Delete the ~/.mitmproxy directory: