httpd部署问题：本地可访问网页但其他电脑无法访问

Hey there! Let's break down why other machines can't reach your Apache setup, even though you can access it locally. Here are the key checks to run through:

1. Confirm the IP Address You're Using #

First off, 172.31.30.53 looks like a private internal IP address (common in AWS EC2 or local network setups).

• If the remote computers are not on the same local network/VPC, you'll need to use your server's public IP instead. Run curl ifconfig.me on your server to grab its public IP, then test that address from the remote machine.
• If they are on the same network, start with basic connectivity: run ping 172.31.30.53 from the remote computer. If ping fails, there's a network routing issue to fix before diving into Apache settings.

2. Check if Port 80 is Reachable Externally #

Your local nmap scan shows port 80 is open, but we need to confirm it's accessible from outside the server:

• On the remote machine, run this command:

  nmap 172.31.30.53 -p 80
  

  If the result says filtered or closed, traffic to port 80 is being blocked somewhere.

3. Double-Check Firewall Rules (Beyond UFW) #

Even though UFW allows port 80, there might be other firewalls in play:

• If you're using a cloud server (like AWS EC2): Verify your security group allows inbound traffic on port 80 from the remote machine's IP (or 0.0.0.0/0 for temporary testing).
• If you're on RHEL/CentOS (since you're using httpd instead of apache2): Check if firewalld is running and permitting HTTP traffic:

  sudo firewall-cmd --list-all
  

  If http isn't listed in the services section, add it with:

  sudo firewall-cmd --add-service=http --permanent
  sudo firewall-cmd --reload
  

4. Update Apache Configuration for Modern Versions #

Your <Directory> block uses Apache 2.2-style authorization rules (Order allow,deny / allow from all). If you're running Apache 2.4 (standard on most modern systems), switch to the newer syntax to avoid compatibility issues:
Edit your /etc/httpd/conf/httpd.conf file and update the directory block:

<Directory /var/www/html>
    AllowOverride None
    # Replace old authorization rules with this line
    Require all granted
</Directory>

Then restart Apache to apply changes:

sudo apachectl restart

5. Verify Apache is Listening on All Interfaces #

Your config has Listen 0.0.0.0:80 (which tells Apache to listen on all network interfaces), but let's confirm this is working:

sudo netstat -tulpn | grep httpd

You should see a line like tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN [PID]/httpd — this confirms Apache isn't restricted to localhost only.

Start with these checks, and share what you find so we can narrow it down further!

内容的提问来源于stack exchange，提问作者Heejun Choi