Thank you for the feedback. It really helps us to improve Fiddler Everywhere.
Based on the stack traces from the logs, it seems that during application startup Fiddler Everywhere is unable to load its root CA certificate for HTTPS traffic from ~/.fiddler/Certificates/RootCertificate.p12 Unfortunately, this case is not handled appropriately in the current version and the rest of the startup logic is not executed. Hence, the proxy settings are not initialized and the Capture button does nothing.
Until, we fix this behavior in the next version, could you please, uncheck the 'Decrypt HTTPS traffic' setting, remove the ~/.fiddler/Certificates/RootCertificate.p12 certificate, then re-check the 'Decrypt HTTPS traffic' and trust the new certificate. This should make Fiddler Everywhere generate a new ~/.fiddler/Certificates/RootCertificate.p12 file which should be valid.
Thanks and Regards,
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