2477300 - Solution Manager Agent Administration link error

When calling the Solution Manager Agent Administration link: http://<host>:<port>/smd/AgentAdmin error in the browser:

500 Internal Server Error

While processing the current request, an exception occured which could not be handled by the application or the framework.

in the default trace:

Exception occured during processing of Web Dynpro application {0}. The causing exception is nested.
[EXCEPTION]
{1}#2#sap.com/tc~smd~server~agent~admin/SMDAgentAdminApplication#java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

and possbily also in the default trace just before the above error:

Caused by: java.sql.SQLException: JZ0C0: Connection is already closed.

SAP NetWeaver Release Independent

solman, agent admin, failed to process request , KBA , SV-SMG-DIA-SRV-AGT , Agent Framework , Problem