EC2实例（Bitnami镜像）WordPress站点无法访问求助

重启EC2实例上的Bitnami WordPress镜像后，浏览器访问站点出现以下错误：

ec2-<IP_address>.eu-central-1.compute.amazonaws.com refused to connect.
ERR_CONNECTION_REFUSED

• 1台EC2实例
• 1个VPC
• 1个公共托管路由表
• 1个网络ACL
• 1个已关联VPC和EC2的弹性IP
• 4个关联VPC的安全组（3个Bitnami安全组，1个默认安全组）
• 1个互联网网关
• 1个DHCP选项集

• 平台：Debian、Linux/UNIX
• AMI名称：bitnami-wordpress-6.0.1-2-r02-linux-debian-11-x86_64-hvm-ebs-nami-7d426cb7-9522-4dd7-a56b-55dd8cc1c8d0
• AMI位置：aws-marketplace/bitnami-wordpress-6.0.1-2-r02-linux-debian-11-x86_64-hvm-ebs-nami-7d426cb7-9522-4dd7-a56b-55dd8cc1c8d0
• 实例两项状态检查均通过：系统可达性检查、实例可达性检查
• 已关联弹性IP，路由表存在对应A记录

执行命令sudo /opt/bitnami/bndiagnostic-tool后，输出摘要如下：

? Resources: Found possible issues
? Connectivity: Found possible issues
✓ Mariadb: No issues found
✓ Processes: No issues found
? Wordpress: Found possible issues
? Apache: Found possible issues
✓ Php: No issues found
...
**Apache**
[Apache]
Press [Enter] to continue:
Found recent error or warning messages in the Apache error log.
[Sun Feb 26 20:59:56.709925 2023] [proxy_fcgi:error] [pid 952:tid
140329768302336] (70007)The timeout specified has expired: [client
**ip_address**:32977] AH01075: Error dispatching request to : (polling),
referer:
https://www.<my-domain-name.com>/wp-admin/admin.php?page=w3tc_dashboard&_wpnonce=521586fa3b&
w3tc_note=flush_all
 [Sun Feb 26 20:59:43.844511 2023] [proxy_fcgi:error] [pid 952:tid
140330158352128] (70007)The timeout specified has expired: [client
**ip_address**:28814] AH01075: Error dispatching request to : (polling),
referer:
https://www.<my-domain-name.com>/wp-admin/admin.php?page=w3tc_dashboard&_wpnonce=521586fa3b
 [Sun Feb 26 21:00:29.519343 2023] [proxy_fcgi:error] [pid 689:tid
140329474819840] (70007)The timeout specified has expired: [client
**ip_address**:51737] AH01075: Error dispatching request to : (polling)
...
**[Wordpress]**
Found recent WordPress plugin related error messages in the Apache error log.

[Sun Feb 26 21:00:44.149415 2023] [proxy_fcgi:error] [pid 952:tid
140330003298048] (70007)The timeout specified has expired: [client
**ip_address**:20346] AH01075: Error dispatching request to : (polling),
referer: https://www.<my-domain-name.com>/wp-admin/plugins.php?s=&plugin_status=all

• 尝试执行sudo systemctl restart httpd重启Web服务，提示Unit httpd.service could not be found.
• 仅能通过Putty以bitnami用户连接实例，使用ec2-user或admin用户通过Putty或EC2 Instance Connect连接时均报错：

Failed to connect to your instance
Error establishing SSH connection to your instance. Try again later.

无法判断问题出在AWS还是Bitnami环境，需要精准的分步解决步骤，可提供更多相关截图。

内容的提问来源于stack exchange，提问作者Dantes