Creating Dynamic DNS host

Creating your first Dynamic DNS host:

1. Create an Account
2. Create a Dynamic DNS Host
3. Install an Update Client
4. Configure your Network

Troubleshooting common service and network configuration errors:

1. Test Your Server
2. Test Your IP Address
3. Test the Port
    - Check your firewalls and router
    - Try an alternate port

4. Check the DNS
   -Check the database
   -Check the host in DNS

source:
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http://www.dyndns.com/services/dns/dyndns/howto.html
http://www.dyndns.com/support/kb/why_cant_i_connect_to_my_server.html