In 12.51 SPS environment, a Target in authentication schemes was set to "/proxyui/forms/login.fcc".
When a user accessed to FQDN:8080(Tomcatport)/proxyui/, got below error.
Server Error. The server was unable to process your request.
The target is specified as described in the following 12.51 SPS Administration Guide;
Type the following value in Target:
Note: To get the context path, open the proxyui.xml file from sps_home/Tomcat/conf and note down the value mentioned in the path parameter.