Hello, I managed to get my subscription working. Here is what I have done on my test environment. My client uses oracle-instant-client 11.2.0.1. My db server is running Oracle 11.2.0.1 release. Both client and server are on Centos OS. Previously, I have client on Centos and server on Solaris. I have done quite few tests with combination of different client, server and their OS. I found that the Oracle version and the OS platform contributed to the issue that I had. As a preliminary quick test, I also ran my client on the same box where my db server was running. In my case, this worked fine. Hopefully, this will help. Cheers, sw