Group Policy Custom Shell Entry Overrides ICA Published Program

If a system policy that uses the Custom Shell option is defined and you use an Independent Computing Architecture (ICA) client to connect to a published program, you receive the custom shell instead of the published program.

The system policy entry is:

This behavior can occur if you choose the custom shell before checking for the existence of a published program or initial program.

This problem was first corrected in Windows NT Server version 4.0, Terminal Server Edition Service Pack 6.