Hi,
There appears to be a problem with clientless connections in version 16.2.98.1741 when connecting via the "Direct" tab and using TSR.
a) Click Session > New Connection
b) Enter account details. Click the Direct tab and enter Host, Port and Service Name. Untick Connect using Oracle Client. Click Connect
c) Enter a query e.g. select 1 from dual;
d) Click Editor > Execute SQL via TSR. An error pops up: Host:Port/Servicename was not found in TNSNames and LDAP. Cannot connect