The host's IP address is either static (does not change) or dynamic (changes from time to time). If you have a dynamic IP address, you will need the current address of the host each time you want to connect. For this reason, you may want to investigate a Domain Naming Service that can provide you with a static IP address. For more information, refer to the document How to use pcAnywhere with a Dynamic IP Address or Domain Name Service.
If the host computer is behind a proxy server, you may see the IP address of the proxy server instead of the host's address. In this situation, it may not be possible for pcAnywhere to connect to the host.
References For information on problems related to pcAnywhere with firewalls and proxy servers, see the following documents: