Users were getting error "Maximum number of connected terminals reached" while logon to R/3 System.
Trace file: /usr/sap/<SID>/DVEBMGS<nr>/work/dev_w0
Trace file: /usr/sap/<SID>/DVEBMGS<nr>/work/dev_disp
The space available in the C table tm_adm is not sufficient for another terminal to log on to this applicatin server. The number of table elements is determined by the profile parameter 'rdisp/tm_max_no' when the application server is started. Important: For internal purposes one entry for each work process and
one entry for each CPIC connection is made in tm_adm in addition to an entry for each work process.
Parameter 'rdisp/tm_max_no' value was set to 200 and when number of terminals exceed 200, users were getting an error "Maximum number of connected terminals reached" during login screen initiation.
Logon to SAP system. Execute T-code RZ10 to change profile parameter.
Change profile parameter 'rdisp/tm_max_no' to more than 200.
Restart SAP instance.