2617837 - ID and ESR not opening due to "Cannot connect to server using message server..." error

• You are unable to logon to the Process Integration (PI) Enterprise Services Repository (ESR) or Integration Builder Directory.
• The system is NOT High-Availability environment
• You are using only one application server.
• The following error/exception can be seen when trying to connect to the ESR or ID:

[...]
com.sap.aii.utilxi.misc.api.ReconnectRuntimeException: Cannot connect to server using message server: ms://<host>:<port>/P4
[...]
Caused by: java.io.IOException: Cannot get Socket. Reason:Connection timed out: connect
 at com.sap.engine.interfaces.cross.io.transport.PortManager.getRealSocket(PortManager.java:283)
 at com.sap.engine.interfaces.cross.LoadBalancerImpl.staticGetAllAccessPoints(LoadBalancerImpl.java:141)
[...]

• SAP Process Integration
• SAP NetWeaver

Integration Builder, Enterprise Services Repository, Process Integration 7.10, PI 7.10, Process Integration 7.11, PI 7.11, Process Integration 7.30, PI 7.30, Process Integration 7.31, PI 7.31, Process Orchestration 7.4, PI 7.4, PO 7.4, Process Orchestration 7.5, PI 7.5, PO 7.5, XI , KBA , BC-XI-IBC , Integration Builder - Configuration , Problem