I am trying to install Appian 7.9 on WAS. getting below error. Can some one help

...apper.request(Mapper.java:63)
at com.appiancorp.kougar.services.KougarServiceInvocationHandler$KInvocationHandler.invoke(KougarServiceInvocationHandler.java:178)
at com.appiancorp.kougar.services.KougarServiceInvocationHandler$KougarMethodInvocation.proceed(KougarServiceInvocationHandler.java:270)
at com.appiancorp.security.authz.AuthorizationMethodInterceptor.invoke(AuthorizationMethodInterceptor.java:54)
at com.appiancorp.kougar.services.KougarServiceInvocationHandler.invoke(KougarServiceInvocationHandler.java:307)
at com.sun.proxy.$Proxy108.getCredentials(Unknown Source)
at com.appiancorp.ag.GroupServiceJavaImpl.getCredentials(GroupServiceJavaImpl.java:551)
at com.appiancorp.ag.GroupServiceJavaImpl.getCachedCredentials(GroupServiceJavaImpl.java:577)
at sun.reflect.GeneratedMethodAccessor26.invoke(Unknown Source)
at sun.re...

...flect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:613)
at com.appiancorp.kougar.services.KougarServiceInvocationHandler$JavaInvocationHandler.invoke(KougarServiceInvocationHandler.java:104)
at com.appiancorp.kougar.services.KougarServiceInvocationHandler$KougarMethodInvocation.proceed(KougarServiceInvocationHandler.java:270)
at com.appiancorp.security.authz.AuthorizationMethodInterceptor.invoke(AuthorizationMethodInterceptor.java:54)
at com.appiancorp.kougar.services.KougarServiceInvocationHandler.invoke(KougarServiceInvocationHandler.java:307)
at com.sun.proxy.$Proxy108.getCachedCredentials(Unknown Source)
at com.appiancorp.services.AbstractServiceContext.getCredentials(AbstractServiceContext.java:236)
at com.appiancorp.services.AbstractServiceContext.getKougarCre...

... dentials(AbstractServiceContext.java:225)
at com.appiancorp.kougar.services.KougarServiceInvocationHandler$KInvocationHandler.invoke(KougarServiceInvocationHandler.java:147)
at com.appiancorp.kougar.services.KougarServiceInvocationHandler$KougarMethodInvocation.proceed(KougarServiceInvocationHandler.java:270)
at com.appiancorp.security.authz.AuthorizationMethodInterceptor.invoke(AuthorizationMethodInterceptor.java:54)
at com.appiancorp.kougar.services.KougarServiceInvocationHandler.invoke(KougarServiceInvocationHandler.java:307)
at com.sun.proxy.$Proxy111.acceptWorkBulk(Unknown Source)
at com.appiancorp.ra.workpoller.WorkServiceImpl.acceptWorkBulk(WorkServiceImpl.java:286)
at com.appiancorp.ra.workpoller.WorkPoller.acceptWorkBulk(WorkPoller.java:301)
at com.appiancorp.ra.workpoller.WorkPoller.run(WorkPoller.java:266)
at com...

... .ibm.ejs.j2c.work.WorkProxy.run(WorkProxy.java:668)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1862)

Can you please check all your appian engine are started properly or not ?

To verify you run:

servever/_scripts/diagnostic/checkengine

I apologize for the typo. It should be:

<APPIAN_HOME>\\server\\_scripts\\diagnostic\\checkengine

Did you find the root cause? I am getting the same error.. Eduardo, any update from your side on this? Ours is on Weblogic. Both are on the same server. I have verified both custom.properties file and topology.xml file and all seems right to me... Check engine returns all 16 engines...? Any other reason?

This error indicates the application server cannot connect to the Appian engines. Things to check:

1. That the application server can connect to the engine server based on its copy of appian-topology.xml.
2. Make sure the ports from appian-topology.xml are open for the application server to communicate
3. If deploying a security token (appian.sec) make sure the token matches on both servers. If there's a mismatch the APP_SERVER won't be able to communicate with the engines.

I configured Appian using ROOT user and then changed to another user. Some KDBs were created using root and some with the other user. Is that a problem? How do I recover from that problem? The engines are not starting now...