3212161 - Switch instance from SM51 is not working

When trying to switch to another dialog instance(running on different host), there is error like:

Communication error with server <hostname>_<SID>_<NR>
:
Error when opening an RFC connection (CPIC-CALL:'

SM51 switch, NIECONN_PENDING, SSL port, gw/internal_port , KBA , BC-CST-GW , Gateway/CPIC , Problem

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