GW logging report shows only entries from solman system and no other servername details

[Appuru]

Hello All,

Customer wants to identify which servers are communicating with the Solman system.

Using this information, they plan to add only those servers to the secinfo or reginfo or ms_acl_info files to mitigate security vulnerabilities.

we have updated the following parameters in the Solution Manager system
gw/sim_mode = 1
gw/logging = ACTION=SPXER LOGFILE=gw_log-%y-%m-%d SWITCHTF=day MAXSIZEKB=100
gw/acl_mode = 1

We completed CHARM setup for S4HANA system and the Managed System Configuration for ABAP and Java systems in SOLMAN system.

however the generated GW logging report shows only entries from Solution manager and no other connection details shows.

SLD_UC, SLD_NUC,ISG_SID only these entries

1.Why are no other connection details visible in the GW logging report? 
2.How can we identify these connection details and Please confirm whether we should add the identified server names to the secinfo or reginfo or ms_acl_info?

Regards

Appuru