How to fix Cannot start service web: driver failed programming external connectivity on endpoint in Docker

# Check what is using the port
sudo lsof -i :PORT_NUMBER
sudo netstat -tlnp | grep PORT_NUMBER

# Check Docker containers using ports
docker ps --format "table {{.Names}}	{{.Ports}}"

sudo systemctl restart docker

# Or on older systems
sudo service docker restart

# Stop and remove all containers
docker stop $(docker ps -aq)
docker rm $(docker ps -aq)

# Remove unused networks
docker network prune

# For Docker Compose specifically
docker-compose down --remove-orphans

# View Docker iptables rules
sudo iptables -L -n | grep -i docker

# Restart Docker to rebuild rules
sudo systemctl restart docker

# If issues persist, flush and restart
sudo iptables -t nat -F DOCKER
sudo systemctl restart docker

# UFW (Ubuntu)
sudo ufw status
# May need to allow Docker traffic

# firewalld (CentOS/RHEL)
sudo firewall-cmd --list-all

# Check if firewall is blocking Docker
sudo journalctl -u docker | grep -i firewall

# List networks
docker network ls

# Remove and recreate the problematic network
docker network rm <network_name>

# For Compose, recreate networks
docker-compose down
docker-compose up -d