One of the security features that can be set with any organization is the ability for the administrator to only permit users to log into SeamlessDesk portal from a specified IP range in which they set.
This setting is a security feature which (if set) can allow agents to only log into the site from their local area network. Sometimes administrators only want clients to be able to access this from their work location.
If you received this message then this setting is in place.
To see more information on this as an administrator you can visit Settings > Site settings > Security > IP Whitelisting