2209654 - Connect to the database with ID <SID> failed

In Solution Manager system, or a central system in which several systems are connected and monitored, In SM21, system log shows many following information:

Connect to the database with ID <SID> failed
Unexpected return value 8192 when calling up DBDS

If you look at relevant work process trace in ST11, error entries can be seen:

B  ***LOG BYI=> connect failed for connection <SID>
B  ***LOG BZY=> unexpected return code 8192 calling DBDS
B  *** ERROR => Cannot open more than 16 connections

Note: Here the main sympton is the third ERROR line. If you do not see this line in your system, this KBA does not fit.

return value 8192, return code 8192, DBDS, Cannot open more than 16 connections , KBA , BC-CCM-MON-ORA , Database Monitors for Oracle , Problem