感謝各位前輩幫忙提供意見，我今日又把所有流程都測試過一遍，這次讓我真的學到超多，因為我主要是全端開發，這實在蠻陌生的領域。

我發現原來是路由器(?)那邊沒有設定到，因為我是真的對網路這塊非常不熟哈哈哈...


在這邊幫443新增就可以了，成功的時候我差點吐血，體會到知識不足的可怕。

另外因為我是在購買憑證的時候，直接用Godaddy的工具(新購買會送一次)生成csr跟key，
後來找資料無意中翻到，原來他給的檔案不是PEM的格式，要自己轉，神奇的是，在我轉換成PEM之前，完全沒有報錯，也算一個坑吧?

如果有路過的邦友有類似的狀況，可以私訊我，也許我能幫上忙。

------------------更新線----------------
各位前輩好，近日在幫公司的伺服器安裝SSL憑證，是購買godaddy的憑證自己安裝，已經照了網上大部分教學的步驟去設定，設定一輪過後，重新啟動apache也沒有錯誤，LOG也沒有，http仍然可以用，https就是不行...
DNS是採用godaddy的 那邊都沒有動過
已經有啟用以下幾個設定
sudo a2enmod ssl
sudo a2enmod headers

需要更多資訊我可以提供!
請幫我看看是不是哪邊做錯了~ 謝謝各位!!!

以下是/etc/apache2/sites-available/000-default.conf的內容
域名我先用yxxxx.co做替代

<VirtualHost *:443>
	ServerAdmin webmaster@localhost
	DocumentRoot /var/www/html
	ServerName yxxxx.co
    ServerAlias www.yxxxx.co
    SSLProtocol All -SSLv2 -SSLv3
	SSLEngine on
	SSLCertificateFile /etc/apache2/ssl/5a4af56c90eb1ce.crt
	SSLCertificateKeyFile /etc/apache2/ssl/generated-private-key.key
	SSLCertificateChainFile /etc/apache2/ssl/gd_bundle-g2-g1.crt
    <FilesMatch "\.(cgi|shtml|phtml|php)$">
      SSLOptions +StdEnvVars
    </FilesMatch>
    <Directory /usr/lib/cgi-bin>
      SSLOptions +StdEnvVars
    </Directory>

	ErrorLog ${APACHE_LOG_DIR}/error.log
	CustomLog ${APACHE_LOG_DIR}/access.log combined

</VirtualHost>

<VirtualHost *:80>
	ServerAdmin webmaster@localhost
	DocumentRoot /var/www/html
	ServerName yxxxx.co

	ErrorLog ${APACHE_LOG_DIR}/error.log
	CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

# vim: syntax=apache ts=4 sw=4 sts=4 sr noet

以下是/etc/apache2/ports.conf的內容

# If you just change the port or add more ports here, you will likely also
# have to change the VirtualHost statement in
# /etc/apache2/sites-enabled/000-default.conf

Listen 80

<IfModule ssl_module>
	Listen 443
</IfModule>

<IfModule mod_gnutls.c>
	Listen 443
</IfModule>

# vim: syntax=apache ts=4 sw=4 sts=4 sr noet

以下是/etc/apache2/apache2.conf的內容
為方便看我刪掉一些註解

DefaultRuntimeDir ${APACHE_RUN_DIR}

PidFile ${APACHE_PID_FILE}

Timeout 300

KeepAlive On

MaxKeepAliveRequests 100

KeepAliveTimeout 5

User ${APACHE_RUN_USER}
Group ${APACHE_RUN_GROUP}

HostnameLookups Off

ErrorLog ${APACHE_LOG_DIR}/error.log

SSLCertificateFile /etc/apache2/ssl/5a4af56c90eb1ce.crt
SSLCertificateKeyFile /etc/apache2/ssl/generated-private-key.key

LogLevel warn

# Include module configuration:
IncludeOptional mods-enabled/*.load
IncludeOptional mods-enabled/*.conf

# Include list of ports to listen on
Include ports.conf

<Directory />
	Options FollowSymLinks
	AllowOverride None
	Require all denied
</Directory>

<Directory /usr/share>
	AllowOverride None
	Require all granted
</Directory>

<Directory /var/www/html/>
	Options Indexes FollowSymLinks
	AllowOverride ALL
	Require all granted
	Header add Access-Control-Allow-Origin *

        Header set Cache-Control "max-age=36000, public"
    <IfModule mod_headers.c>
        Header always set X-Content-Type-Options "nosniff"
    </IfModule>
</Directory>

AccessFileName .htaccess

<FilesMatch "^\.ht">
	Require all denied
</FilesMatch>

LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined
LogFormat "%h %l %u %t \"%r\" %>s %O" common
LogFormat "%{Referer}i -> %U" referer
LogFormat "%{User-agent}i" agent

# Include of directories ignores editors' and dpkg's backup files,
# see README.Debian for details.

# Include generic snippets of statements
IncludeOptional conf-enabled/*.conf

# Include the virtual host configurations:
IncludeOptional sites-enabled/*.conf

# vim: syntax=apache ts=4 sw=4 sts=4 sr noet

以下是netstat -an | grep :443的結果

tcp6       0      0 :::443                  :::*                    LISTEN  

以下是apachectl -S的結果

AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
VirtualHost configuration:
*:443                  yxxxx.co (/etc/apache2/sites-enabled/000-default.conf:1)
*:80                   yxxxx.co (/etc/apache2/sites-enabled/000-default.conf:24)
ServerRoot: "/etc/apache2"
Main DocumentRoot: "/var/www/html"
Main ErrorLog: "/var/log/apache2/error.log"
Mutex rewrite-map: using_defaults
Mutex ssl-stapling-refresh: using_defaults
Mutex ssl-stapling: using_defaults
Mutex ssl-cache: using_defaults
Mutex default: dir="/var/run/apache2/" mechanism=default 
Mutex mpm-accept: using_defaults
Mutex watchdog-callback: using_defaults
PidFile: "/var/run/apache2/apache2.pid"
Define: DUMP_VHOSTS
Define: DUMP_RUN_CFG
User: name="www-data" id=33 not_used
Group: name="www-data" id=33 not_used