Ubuntu 16.04 LTS下Apache多域名无法访问，提示ERR_CONNECTION_TIMED_OUT求助

Hey there! Let's work through your two main issues—domain timeouts and only seeing one site internally—step by step.

1. Fixing ERR_CONNECTION_TIMED_OUT for Your Domains #

This usually boils down to dynamic IP sync issues, firewall blocks, or ISP restrictions. Here's what to check:

• Verify Namecheap Dynamic DNS is Updating Your IP
  Since you're using a dynamic public IP, Namecheap needs real-time updates when your IP changes. Set up a simple auto-update script on Ubuntu to keep things in sync:

  # Create a script (replace placeholders with your domain and Namecheap DDNS password)
  sudo nano /usr/local/bin/update-namecheap-dns.sh
  

  Paste this into the script:

  #!/bin/bash
  DOMAIN="yourdomain.com"
  PASSWORD="your_ddns_password_from_namecheap"
  curl "https://dynamicdns.park-your-domain.com/update?host=@&domain=$DOMAIN&password=$PASSWORD"
  

  Make it executable:

  sudo chmod +x /usr/local/bin/update-namecheap-dns.sh
  

  Add a cron job to run it every 15 minutes:

  crontab -e
  

  Add this line at the bottom:

  */15 * * * * /usr/local/bin/update-namecheap-dns.sh
  

  Save and exit—this ensures your Namecheap records always match your current public IP.

• Check Firewalls (Ubuntu & Router)

  • On Ubuntu, confirm UFW allows port 80:

    sudo ufw status
    

    If "80/tcp" isn't listed as allowed, run:

    sudo ufw allow 80/tcp
    

  • Double-check your router's port forwarding rule for 80 → 10.0.0.111—make sure it's enabled and targeting the correct internal IP. Some ISPs block port 80 by default: test this by temporarily forwarding port 8080 to your Ubuntu machine and accessing yourdomain.com:8080 from your phone's 4G network. If that works, your ISP is blocking 80, and you'll need to use an alternative port or request unblocking.

• Confirm Public IP Accessibility
  On your Ubuntu machine, run curl ifconfig.me to get your current public IP. Visit that IP directly from your phone's 4G (e.g., http://123.45.67.89). If this times out too, the issue is with your router's forwarding or ISP restrictions, not Apache.

2. Making All Sites Accessible Internally #

Right now, Apache is serving its default site when you visit 10.0.0.111 because you haven't set up virtual hosts to map each domain to its own content. Here's how to fix that:

• Create Site Directories & Set Permissions
  For each domain, make a root directory for its files:

  # Replace with your actual domains
  sudo mkdir -p /var/www/yourfirstdomain.com/public_html
  sudo mkdir -p /var/www/yourseconddomain.com/public_html
  sudo mkdir -p /var/www/yourthirddomain.com/public_html
  

  Set ownership so you can edit files without sudo:

  sudo chown -R $USER:$USER /var/www/yourfirstdomain.com/public_html
  sudo chown -R $USER:$USER /var/www/yourseconddomain.com/public_html
  sudo chown -R $USER:$USER /var/www/yourthirddomain.com/public_html
  sudo chmod -R 755 /var/www
  

  Add unique index.html files to each public_html folder so you can distinguish the sites.

• Set Up Apache Virtual Hosts
  Copy the default config as a template for each domain:

  sudo cp /etc/apache2/sites-available/000-default.conf /etc/apache2/sites-available/yourfirstdomain.com.conf
  sudo cp /etc/apache2/sites-available/000-default.conf /etc/apache2/sites-available/yourseconddomain.com.conf
  sudo cp /etc/apache2/sites-available/000-default.conf /etc/apache2/sites-available/yourthirddomain.com.conf
  

  Edit each config file (replace with your domain):

  sudo nano /etc/apache2/sites-available/yourfirstdomain.com.conf
  

  Modify it to look like this:

  <VirtualHost *:80>
      ServerAdmin webmaster@yourfirstdomain.com
      ServerName yourfirstdomain.com
      ServerAlias www.yourfirstdomain.com
      DocumentRoot /var/www/yourfirstdomain.com/public_html
  
      ErrorLog ${APACHE_LOG_DIR}/error.log
      CustomLog ${APACHE_LOG_DIR}/access.log combined
  </VirtualHost>
  

  Repeat this for your other two domains.

• Enable the Sites & Restart Apache
  Enable each virtual host config:

  sudo a2ensite yourfirstdomain.com.conf
  sudo a2ensite yourseconddomain.com.conf
  sudo a2ensite yourthirddomain.com.conf
  

  Disable the default site to avoid conflicts (optional but recommended):

  sudo a2dissite 000-default.conf
  

  Restart Apache to apply changes:

  sudo systemctl restart apache2
  

• Test Internally with Hosts File
  To test domains from your Windows 10 machine, map them to the Ubuntu internal IP via the hosts file:

  1. Open Notepad as Administrator.
  2. Open C:\Windows\System32\drivers\etc\hosts.
  3. Add these lines at the bottom (replace with your domains):

     10.0.0.111 yourfirstdomain.com
     10.0.0.111 yourseconddomain.com
     10.0.0.111 yourthirddomain.com
     

  4. Save the file. Now visiting each domain in your Windows browser will load the corresponding site.

内容的提问来源于stack exchange，提问作者Michael H Graf Sr.