Basically, SSLPassPhraseDialog directive in Apache is not supported in Windows and this results in SSLPassPhraseDialog builtin is not supported on Win32 error.
We have previously assisted customers in solving Apache related issues as part of our Server Support Services.
Let us take a look at the nature of this error and how to get rid of it.
The nature of "SSLPassPhraseDialog builtin is not supported on Win32" error
When the SSLPassPhraseDialog directive is specified in Apache configuration file (ssl.conf or httpd.conf), SSLPassPhraseDialog builtin is not supported error occurs because it is not supported in windows.
Additionally, when you use a password to encrypt a private key in a Windows server, an error will be thrown once you restart Apache as it does not support encrypted private keys on Windows.
How to solve "SSLPassPhraseDialog builtin is not supported on Win32" error
To fix this error, first we need to know that main reason why it occurred which can be read via the log files.
You can take the following steps to resolve this issue;
i. Ensure that you take off any encryption on private keys in the Windows server.
ii. Finally, you should observe the Apache configuration file for SSLPassPhraseDialog directives or place an # before it to comment it.
Then you can restart Apache for the changes to take effect.