diff --git a/etc/tomcat/conf/server.xml b/etc/tomcat/conf/server.xml
index c3d1443..db65ca4 100644
--- a/etc/tomcat/conf/server.xml
+++ b/etc/tomcat/conf/server.xml
@@ -102,17 +102,15 @@
       <Host name="localhost"  appBase="webapps" unpackWARs="false" autoDeploy="false">
 
           <Context path="/cas" docBase="${server.webapps}/cas" reloadable="false" crossContext="true"/>
+          <Context path="/externalid" docBase="/opt/tomcat/webapps/externalid" reloadable="false"  crossContext="true">
+            <Valve className="org.apache.catalina.valves.RemoteAddrValve" allow="127\.\d+\.\d+\.\d+|::1|0:0:0:0:0:0:0:1"/>
+            <Parameter name="spring.config.additional-location" value="{PROPERTIES-FILE}"/>
+          </Context>
           <Context path="/manager" docBase="${server.home}/webapps/manager" reloadable="false" antiResourceLocking="false" privileged="true" useHttpOnly="true">
           </Context>
           <Context path="/probe" docBase="${server.webapps}/psi-probe" reloadable="false" antiResourceLocking="false" privileged="true" useHttpOnly="true" >
           </Context>
 
-        <!-- SingleSignOn valve, share authentication between web applications
-             Documentation at: /docs/config/valve.html -->
-        <!--
-        <Valve className="org.apache.catalina.authenticator.SingleSignOn" />
-        -->
-
         <!-- Access log processes all example.
              Documentation at: /docs/config/valve.html
              Note: The pattern used is equivalent to using pattern="common" -->
diff --git a/gradle.properties b/gradle.properties
index b6664fd..e85a7bd 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -8,4 +8,6 @@ waroverlayPluginVersion=0.9.3
 
 casServerVersion=7.1.1-esco-1.0.2
 
+externalIdApiVersion=1.0.0
+
 org.gradle.parallel=true
diff --git a/overlays/externalid-api/build.gradle b/overlays/externalid-api/build.gradle
new file mode 100644
index 0000000..c64f033
--- /dev/null
+++ b/overlays/externalid-api/build.gradle
@@ -0,0 +1,9 @@
+dependencies {
+    runtimeOnly "fr.recia.esco.sarapis.api:externalids:${externalIdApiVersion}@war"
+}
+
+war {
+    archiveFileName="externalid.war"
+
+    classpath = classpath.files
+}
\ No newline at end of file
diff --git a/settings.gradle b/settings.gradle
index 4b4085a..83e1b32 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -10,4 +10,5 @@
 rootProject.name = 'gradle-war-deployer'
 
 include 'overlays:cas'
+include 'overlays:externalid-api'
 include 'overlays:psi-probe'