Unable To Login To WebCenter Sites 12c with WebCenter Portal installed to the Same Domain. (Doc ID 2087497.1)

WebCenter Sites 12c and WebCenter Portal are installed to the same domain and when attempting to login to sites 12c after successful installation,
the following error occurs.

javax.servlet.ServletException: Failed gateway redirect java.io.UnsupportedEncodingException: Redirect failed due to illegal URL http://localhost:7003/sites/wem/fatwire/wem/Welcome
at com.fatwire.wem.sso.cas.filter.CASFilter.sendResponse(CASFilter.java:681)
at com.fatwire.wem.sso.cas.filter.CASFilter.doFilter(CASFilter.java:598)
at com.fatwire.wem.sso.SSOFilter.doFilter(SSOFilter.java:51)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78)
at COM.FutureTense.Security.Common.ContentSecurityFilter.doFilter(ContentSecurityFilter.java:88)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78)
at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:141)
at java.security.AccessController.doPrivileged(Native Method)
at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:315)
at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:649)
at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:124)
at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:232)
at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:94)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:78)
at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:224)

Cause

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