diff --git a/full/Changes b/full/Changes
index 6999ef4..b805ac1 100644
--- a/full/Changes
+++ b/full/Changes
@@ -7,6 +7,7 @@
   info APIs (#539)
 - Added getting username from LDAP (#568)
 - Disabled LDAP auth provider and token API in the auth filter (#587)
+- Added LDAP log for users without idsC2Profile
 
 # version 0.69.3
 
diff --git a/full/src/main/java/de/ids_mannheim/korap/authentication/LdapAuth3.java b/full/src/main/java/de/ids_mannheim/korap/authentication/LdapAuth3.java
index a597f62..15b1b56 100644
--- a/full/src/main/java/de/ids_mannheim/korap/authentication/LdapAuth3.java
+++ b/full/src/main/java/de/ids_mannheim/korap/authentication/LdapAuth3.java
@@ -15,6 +15,8 @@
 import javax.net.ssl.SSLSocketFactory;
 
 import org.apache.commons.text.StringSubstitutor;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 
 import com.unboundid.ldap.sdk.BindResult;
 import com.unboundid.ldap.sdk.Filter;
@@ -50,6 +52,7 @@
     public static final int LDAP_AUTH_RNAUTH = 7; // User Account or Pwd unknown, or not authorized
     final static Boolean DEBUGLOG = false;        // log debug output.
 
+    private static Logger jlog = LogManager.getLogger(LdapAuth3.class);
 
     public static String getErrMessage(int code) {
         switch (code) {
@@ -279,6 +282,7 @@
             username = entry.getAttributeValue(idsC2Attribute);
             if (username == null) {
                 username = entry.getAttributeValue(uidAttribute);
+                jlog.warn("idsC2Profile not found for uid: "+username);
             }
         }
         return username;
diff --git a/full/src/main/resources/log4j2.properties b/full/src/main/resources/log4j2.properties
index c366776..76fd08f 100644
--- a/full/src/main/resources/log4j2.properties
+++ b/full/src/main/resources/log4j2.properties
@@ -1,3 +1,4 @@
+#appenders = console, mainFile, ldapFile
 appenders = console, mainFile
 appender.console.type = Console
 appender.console.name = STDOUT
@@ -10,6 +11,13 @@
 appender.mainFile.layout.type=PatternLayout
 appender.mainFile.layout.pattern= %d{yyyy-MM-dd, HH:mm:ss} %C{6} - %M%n %-5p: %m%n
 
+#appender.ldapFile.type = File
+#appender.ldapFile.name = LDAP_LOG
+#appender.ldapFile.fileName=./logs/ldap.log
+#appender.ldapFile.layout.type=PatternLayout
+#appender.ldapFile.layout.pattern= %d{yyyy-MM-dd, HH:mm:ss} %C{6} - %M%n %-5p: %m%n
+
+
 rootLogger.level = warn
 rootLogger.appenderRefs = console,mainFile
 rootLogger.appenderRef.file.ref = MAINLOG
@@ -27,4 +35,11 @@
 logger.console.level = warn
 logger.console.appenderRefs = file
 logger.console.appenderRef.file.ref = MAINLOG
-logger.console.additivity=false
\ No newline at end of file
+logger.console.additivity=false
+
+#loggers=file
+#logger.file.name=de.ids_mannheim.korap.authentication.LdapAuth3
+#logger.file.level = info
+#logger.file.appenderRefs = file
+#logger.file.appenderRef.file.ref = LDAP_LOG
+#logger.file.additivity=false
\ No newline at end of file
diff --git a/full/src/test/resources/log4j2-test.properties b/full/src/test/resources/log4j2-test.properties
index 872b150..50d78e7 100644
--- a/full/src/test/resources/log4j2-test.properties
+++ b/full/src/test/resources/log4j2-test.properties
@@ -1,4 +1,4 @@
-appenders = console
+appenders = console,ldapFile
 appender.console.type = Console
 appender.console.name = STDOUT
 appender.console.layout.type = PatternLayout
@@ -10,6 +10,12 @@
 #appender.file.layout.type=PatternLayout
 #appender.file.layout.pattern= %d{yyyy-MM-dd, HH:mm:ss} %C{6} - %M%n %-5p: %m%n
 
+appender.ldapFile.type = File
+appender.ldapFile.name = LDAP_LOG
+appender.ldapFile.fileName=./logs/ldap.log
+appender.ldapFile.layout.type=PatternLayout
+appender.ldapFile.layout.pattern= %d{yyyy-MM-dd, HH:mm:ss} %C{6} - %M%n %-5p: %m%n
+
 rootLogger.level = error
 rootLogger.appenderRefs = console
 rootLogger.appenderRef.stdout.ref = STDOUT
@@ -41,3 +47,10 @@
 logger.console.appenderRefs = stdout
 logger.console.appenderRef.file.ref = STDOUT
 logger.console.additivity=false
+
+loggers=file
+logger.file.name=de.ids_mannheim.korap.authentication.LdapAuth3
+logger.file.level = info
+logger.file.appenderRefs = file
+logger.file.appenderRef.file.ref = LDAP_LOG
+logger.file.additivity=false
\ No newline at end of file