ERDAS APOLLO Portray service doesn't work with a WCS. Typically, a WCS cannot be displayed within the Vector Style editor with the APOLLO portray service.
IIS is configured by default to restrict URL and querystring lengths (a typical effective security mitigation technique). However, the query string to the Portray service requires a SLD style containing the WCS service. The URL and/or query string can be consequently longer than the maximum length allowed by IIS.
Being aware of the security consequences, it is possible to edit the maximum query string and URL lengths allowed by IIS.
<system.web> <httpRuntime maxQueryStringLength="10000" maxUrlLength="10000"/> </system.web>