Many DSL and cable Internet connections assign your machine a new IP address each time you connect to the Internet. This is known as a Dynamic IP address. RemotelyAnywhere will work if you have a dynamic IP (DNS) address, but RemotelyAnywhere needs to be able to track your IP address so that if it changes, the connection can be maintained. There are dynamic DNS solutions available, often for free, which means that your machine can be assigned a fully qualified and static domain name regardless of your IP address. Alternatively, under Preferences > Network you can configure RemotelyAnywhere to send you an email message pointing to the IP address of your remote host every time it detects a change. This way, you always know where to find your Host.