Error: A communication failure occurred while attempting to obtain an initial
context with the provider URL: "iiop://hostname:2825".

Problem

During the installation of the InfoSphere Information Server engine tier onto a separate server from the Domain/Repository tier, the following error occurred. This same also occur when DataStage clients attempt to login to DataStage server. Error The following exception has occurred: A communication failure occurred while attempting to obtain an initial context with the provider URL: "iiop://hostname:2825". Make sure that any bootstrap address information in the URL is correct and that the target name server is running. A bootstrap address with no port specification defaults to port 2809. DataStage clients may also receive the related error message: "Failed to authenticate the current user against the selected domain. You are attempting to connect to server[servername]. This server is configured to communicate with clients using hostname [hostname] on port [2809]. [servername]:2809] is not reachable. Ensure that the [servername] can be resolved and that communication on port [2809] between this machine and the server is not blocked."