Firewall Information: Erlanger Chart Room


ECR uses a private protocol based on verified requests from a client machine to servers hosted by Phil Erlanger Research Co., Inc. These servers are themselves protected by firewalls and constantly update virus monitoring software from outside interference. Only authorized users may connect to the service, and only transactional data is transferred from server to client (ie., no email, no web pages, etc). The protocol requires only a single port to be opened to the ECR server - the client program uses any available local port. (Erlanger IP Address and Port 3990 or Port 80).  The client program is a C++ app delivered as a self-installing package, and requires no manual configuration other than supplying a valid user name and password.

ECR has a backup server at IP Address, port 3990. These addresses should also be opened in your firewall in case the primary server does not respond.
ECR has the capability to select the single port to be used by the ECR server. Right click on ECR's desktop icon and append to the target address one of the following:
For our corporate clients having issues with port 3990, you could enter:
The backup server does not currently support port 80.
For our corporate clients having issues with port 80, you could enter:,


If you need assistance with customer service, such as questions regarding firewall issues, please e-mail to:

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