2번은 unix제품은 etc/sqlhosts라는 파일을 참조하는데 nt 계열은 registry에 저장합니다.
regedit 하시고 sqlhosts를 찾기로 찾아보시면 등록한 내용이 있읍니다.


1번 답은 아래의 내용 참조하세요. 
버그 패치된 제품을 써야 할듯하네요.
http://www-03.ibm.com/developerworks/blogs/page/gbowerman?entry=ids_and_terminal_server_remote

IDS and Terminal Server/Remote Desktop

With XP and Windows Server 2003 having Remote Desktop functionality built-in it's become a standard way to maintain lab machines and to work remotely. I tend to use a combination of VNC for Windows 2000 and Remote Desktop (which I'll refer to as Terminal Services from now on) for W2K3 and 64-bit windows.

To support multiple sessions, applications running on terminal services clients need to specify Global namespaces when connecting to server objects (such as shared memory). When the APIs changed, a few fixes were required to Informix Dynamic Server to fully support terminal services.

Some people may run into problems using terminal services on XP as there are various trialware copies of IDS 9.40.TC2 for Windows floating about, including one downloadable from IIUG. The last terminal services bug was ironed out in IDS 7.31.TD9 and 9.40.TC5. (IDS 10 fully supports terminal services.)

For the completist, here are the bug fixes (with links to technotes where relevant):
151637 'ONSTAT -' IN 'TERMINAL SERVICES' SESSION REPORTS 'SHARED MEMORY NOT INITIALIZED ...' - fixed in 7.31.TD5 and 9.30.TC6 and higher
161355 SERVER INSTALL ON A FRESH XP MACHINE REPORTS THAT THE SERVER WAS NOT INITIALIZED CORRECTLY EVEN THOUGH THE SERVER INITIALIZED SUCCESSFULLY - fixed in 7.31.TD9 and 9.30.TC6 and higher
162925 SERVER INSTALLED ON .NET MACHINE REPORTS THAT THE SERVER WAS NOT INITIALIZED CORRECTLY EVEN THOUGH THE SERVER INITIALIZED SUCCESSFULLY - fixed in 7.31.TD9 and 9.40.TC4 and higher.
165897 ONBAR CAN FAIL WITH 'NO RESPONSE WAS RECEIVED FROM THE DATABASE SERVER' ON WINDOWS WITH TERMINAL SERVICES - fixed in 7.31.TD9 and 9.40.TC5 and higher.