Improper proxy configuration incorrectly configured proxy settings in your scraping or automation script can interfere with the tls handshake process Certificate validation issues some tools or environments may block the connection if they cannot verify the ssl certificate used by the destination server Summary ssl authentication failure when using a proxy server may be caused by a variety of reasons By carefully examining the proxy server's configuration, certificates, trust relationships, the client's network configuration, and network connection and firewall settings, you can find the source of the problem and take appropriate resolutions.
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