AppSync: New Install or Upgrade to 4.x Shows "404 not found internal server error" on Login

Summary: Getting error "404 Not found internal server error" when logging into the AppSync UI after a new install of or upgrade to AppSync 4.x. The error is seen in server logs, and a generic warning is received when installing or upgrading. ...

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Symptoms

Getting error "404 Not found / internal server error" while logging into the AppSync UI after a new install of or upgrade to AppSync 4.x. The below error is seen in server logs, and a generic warning while installing or upgrading is received.

Server logs: 
<Date> ERROR [MSC service thread 1-2] [org.jboss.msc.service.fail] [] [] MSC000001: Failed to start service jboss.server.controller.management.security_realm.UndertowRealm.key-manager:
  org.jboss.msc.service.StartException in service jboss.server.controller.management.security_realm.UndertowRealm.key-manager: 
  WFLYDM0086: The KeyStore can not be found at C:\EMC\AppSync\jboss\.\standalone\configuration\cas.jks
As per the error, going to the location "<Installation Drive>\EMC\AppSync\jboss\standalone\configuration>,"  shows the security files such as cas.crt and cas.jks are missing. If you try a fresh install, these files still are not created under the required location.

Cause

The hostname of the AppSync server in which AppSync is installing the name, starts with digits. AppSync uses JDK-Java (Third-Party Framework) which does not support generating a certificate (cas.crt) if FQDN-host name starts with digits. Due to which, the .crt file is not getting created, and the AppSync user is unable to log in.

Resolution

Workaround:
Have the user change the first character of the AppSync server hostname to alphabetical, and this should allow the issue to be resolved.

Additional Information

As of the writing of this article, there is no determination for support of hostnames starting with a number as the AppSync Server name.
Refer to the AppSync documentation or note this article when calling in a service request should additional information be required.

Affected Products

AppSync

Products

AppSync
Article Properties
Article Number: 000067321
Article Type: Solution
Last Modified: 29 Oct 2025
Version:  4
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