I setup ssl on localhost (wamp), I made the ssl crt with GnuWIn32.

When I try to login with fb in Chrome I get the following message:

URL:

https://localhost/ServerSide/fb-callback.php?code=.....#_=_

Error:

Your connection is not private.
Attackers might be trying to steal your information from localhost (for example, passwords, messages, or credit cards). NET::ERR_CERT_INVALID. localhost normally uses encryption to protect your information. When Chrome tried to connect to localhost this time, the website sent back unusual and incorrect credentials. This may happen when an attacker is trying to pretend to be localhost, or a Wi-Fi sign-in screen has interrupted the connection. Your information is still secure because Chrome stopped the connection before any data was exchanged.

You cannot visit localhost right now because the website sent scrambled credentials that Chrome cannot process. Network errors and attacks are usually temporary, so this page will probably work later.

My SSL Config:

Listen 443    
SSLCipherSuite HIGH:MEDIUM:!aNULL:!MD5    
SSLPassPhraseDialog  builtin    
SSLSessionCache        "shmcb:c:/wamp/www/ssl/logs/ssl_scache(512000)"
SSLSessionCacheTimeout  300    
<VirtualHost *:443>    
DocumentRoot "c:/wamp/www"
ServerName localhost:443
ServerAdmin admin@example.com
ErrorLog "c:/wamp/logs/error.log"
TransferLog "c:/wamp/logs/access.log"
SSLEngine on
SSLCertificateFile "c:/wamp/www/ssl/ia.crt"
SSLCertificateKeyFile "c:/wamp/www/ssl/ia.key"
<FilesMatch "\.(cgi|shtml|phtml|php)$">
    SSLOptions +StdEnvVars
</FilesMatch>
<Directory "c:/Apache24/cgi-bin">
    SSLOptions +StdEnvVars
</Directory>    
BrowserMatch "MSIE [2-5]"  nokeepalive ssl-unclean-shutdown \
         downgrade-1.0 force-response-1.0
CustomLog "c:/wamp/logs/ssl_request.log" \
          "%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \"%r\" %b"
</VirtualHost>   

My question is how to setup valid SSL certificate on localhost? or do I need to edit my configuration?

Chromium Version 79 through (at least) Version 131

Allow Insecure SSL (localhost)

In Chrome enable allow insecure localhost at this url:

chrome://flags/#allow-insecure-localhost

Refer to this Stack Overflow for more information.

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Allow Insecure SSL (other)

1. See "Your connection is not private. blah-bla-blah"...
2. Type thisisunsafe (key listeners pick it up).

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Notes

If you are just curious if this works, browse this site which has a bad root ssl certificate. Other "bad ssl" sites can be found using badssl.com.

More about the chromium "override keyword":.

This is specific for each site.

The chrome developers also do change this periodically.

Since Version 79 the BYPASS_SEQUENCE is and has been dGhpc2lzdW5zYWZl (base64 encoding for "thisisunsafe").