2846257 - Error "Cannot connect to server using message server" occurs during Integration Builder logons

VPN is used to connect to SAP PI/PO system. Integration Builder tools (ESR or ID) work internally. There is no problem to open the web pages like NWA, SLD..However when trying to open Integration Builder tools (ESR or ID) via VPN, the error occurs:

Cannot connect to server using message server:
ms://<mesage server hostname>:<message server port>/P4

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• PI Release Independent
• SAP NetWeaver
• SAP Process Integration

SAP NetWeaver 2004 ; SAP NetWeaver 7.0 ; SAP NetWeaver 7.3 ; SAP NetWeaver 7.4 ; SAP NetWeaver 7.5 ; SAP NetWeaver Process Integration 7.1 ; SAP enhancement package 1 for SAP NetWeaver 7.0 ; SAP enhancement package 1 for SAP NetWeaver 7.3 ; SAP enhancement package 1 for SAP NetWeaver Process Integration 7.1

ESR, ID, VPN, P4, network, message server, Enterprise Services Repository, Integration Builder, Integration Directory, Process Integration 7.0, PI 7.0, PI 7.01, PI 7.02, 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, NetWeaver, XI, AEX , KBA , BC-XI-IBC , Integration Builder - Configuration , Problem