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When the server is linked with wolfSSL, it doesn't seem to print all error messages. Sometimes, it just prints "Please supply a buffer for error string". For example:
2020-05-06 10:23:28 0 [Warning] Failed to setup SSL
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2020-05-06 10:23:28 0 [Warning] SSL error: SSL_CTX_set_default_verify_paths failed
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2020-05-06 10:23:28 0 [Warning] SSL error: Please supply a buffer for error string
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2020-05-06 10:23:28 0 [Warning] SSL error: Please supply a buffer for error string
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2020-05-06 10:23:28 0 [Warning] SSL error: Please supply a buffer for error string
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2020-05-06 10:23:28 0 [Warning] SSL error: Please supply a buffer for error string
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2020-05-06 10:23:28 0 [Warning] SSL error: Please supply a buffer for error string
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2020-05-06 10:23:28 0 [Warning] SSL error: Please supply a buffer for error string
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2020-05-06 10:23:28 0 [Warning] SSL error: Please supply a buffer for error string
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Other wolfSSL users have also reported this problem previously:
https://www.wolfssl.com/forums/topic599-openssl-compatibility-and-errerrorstring.html
That post is almost 6 years old now, so hopefully there is actually a solution to this problem in recent versions of wolfSSL.
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