OpenSSL PEM_read_bio error on Windows: Expecting TRUSTED CERTIFICATE

If you are encountering the OpenSSL PEM_read_bio error on Windows with the message "Expecting TRUSTED CERTIFICATE," there are a few potential solutions that may help resolve the issue.

First, make sure that you are specifying the correct file path for your certificate. Double-check that the file exists in the location you have specified and that the file name and extension are correct.

If the file path is correct, try adding the -trusted option to your OpenSSL command. This will specify a trusted certificate to use in the verification process. For example:

openssl s_client -connect example.com:443 -CAfile trusted.crt

If neither of these solutions work, it is possible that the certificate itself is invalid or corrupt. In this case, you may need to obtain a new certificate from the issuing authority.

It is also worth noting that some versions of OpenSSL may have compatibility issues with certain operating systems. If you have exhausted all other options, try upgrading to a newer version of OpenSSL or using a different operating system.

Overall, the OpenSSL PEM_read_bio error on Windows with the message "Expecting TRUSTED CERTIFICATE" can be caused by a variety of issues, but these solutions should help resolve the most common causes of the error.

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