Merge pull request #160 from jkakavas/add-saml-symptom

Add section for misconfigured sp entity id

Author: jkakavas

docs/en/stack/security/troubleshooting.asciidoc

@@ -497,6 +497,34 @@ its correct public URL.
 Authentication in {kib} fails and the following error is printed in the
 {es} logs:
 
+....
+Authentication to realm saml1 failed - Provided SAML response is not valid for realm
+saml/saml1 (Caused by ElasticsearchSecurityException[Conditions [https://some-url-here...]
+do not match required audience [https://my.kibana.url]])
+....
+
+*Resolution:*
+
+We received a SAML response that is addressed to another SAML Service Provider.
+This usually means that the configured SAML Service Provider Entity ID in
+`elasticsearch.yml` (`sp.entity_id`) does not match what has been configured as
+the SAML Service Provider Entity ID in the SAML Identity Provider documentation.
+
+To resolve this issue, ensure that both the saml realm in {es} and the IdP are
+configured with the same string for the SAML Entity ID of the Service Provider.
+
+TIP: These strings are compared as case-sensitive strings and not as
+canonicalized URLs even when the values are URL-like. Be mindful of trailing
+slashes, port numbers, etc.
+
+--
+
+. *Symptoms:*
++
+--
+Authentication in {kib} fails and the following error is printed in the
+{es} logs:
+
 ....
 Cannot find metadata for entity [your:entity.id] in [metadata.xml]
 ....