diff --git a/src/main/kotlin/de/gmuth/ipp/client/IppClient.kt b/src/main/kotlin/de/gmuth/ipp/client/IppClient.kt
index fcd7e1df..d516d528 100644
--- a/src/main/kotlin/de/gmuth/ipp/client/IppClient.kt
+++ b/src/main/kotlin/de/gmuth/ipp/client/IppClient.kt
@@ -33,7 +33,7 @@ open class IppClient(val config: IppConfig = IppConfig()) : IppExchange {
     var responseInterceptor: IppResponseInterceptor? = null
     var saveMessages: Boolean = false
     var saveMessagesDirectory = File("ipp-messages")
-    var onExceptionSaveMessages: Boolean = false
+    var onExceptionSaveMessages: Boolean = true
     var throwWhenNotSuccessful: Boolean = true
     var disconnectAfterHttpPost: Boolean = false
 
@@ -76,7 +76,7 @@ open class IppClient(val config: IppConfig = IppConfig()) : IppExchange {
         logger.fine { "Send '$operation' request to $printerOrJobUri" }
         httpPost(toHttpUri(printerOrJobUri), request).also {
             logger.finer { "Req #${request.requestId} @${printerOrJobUri.host}: $request => $it" }
-            if(logger.isLoggable(FINEST)) {
+            if (logger.isLoggable(FINEST)) {
                 request.log(logger, FINEST, ">>> ")
                 it.log(logger, FINEST, "<<< ")
             }
@@ -129,10 +129,13 @@ open class IppClient(val config: IppConfig = IppConfig()) : IppExchange {
         if (containsGroup(Unsupported)) unsupportedGroup.values.forEach { logger.warning() { "Unsupported: $it" } }
         if (!isSuccessful()) {
             IppRegistrationsSection2.validate(request)
-            if (throwWhenNotSuccessful) {
-                throw if (status == ClientErrorNotFound) ClientErrorNotFoundException(request, response)
+            val exception =
+                if (status == ClientErrorNotFound) ClientErrorNotFoundException(request, response)
                 else IppOperationException(request, response)
-            }
+            if (onExceptionSaveMessages)
+                exception.saveMessages("${request.operation}_${status}_${request.requestId}")
+            if (throwWhenNotSuccessful)
+                throw exception
         }
     }
 
diff --git a/src/main/kotlin/de/gmuth/ipp/client/IppPrinter.kt b/src/main/kotlin/de/gmuth/ipp/client/IppPrinter.kt
index 5861eafd..9c5903d6 100644
--- a/src/main/kotlin/de/gmuth/ipp/client/IppPrinter.kt
+++ b/src/main/kotlin/de/gmuth/ipp/client/IppPrinter.kt
@@ -477,9 +477,9 @@ class IppPrinter(
     }
 
     fun checkNotifyEvents(notifyEvents: Collection<String>?) = notifyEvents?.let {
+        if (!attributes.containsKey("notify-events-supported"))
+            throw IppException("Printer does not support event notifications.")
         if (it.isNotEmpty() && it.first() != "all") {
-            if (!attributes.containsKey("notify-events-supported"))
-                throw IppException("Printer does not support request parameter 'notifyEvents'.")
             checkIfValueIsSupported("notify-events", it, true)
         }
     }
diff --git a/src/main/kotlin/de/gmuth/ipp/core/IppMessage.kt b/src/main/kotlin/de/gmuth/ipp/core/IppMessage.kt
index 4133ea62..3bdd424f 100644
--- a/src/main/kotlin/de/gmuth/ipp/core/IppMessage.kt
+++ b/src/main/kotlin/de/gmuth/ipp/core/IppMessage.kt
@@ -1,7 +1,7 @@
 package de.gmuth.ipp.core
 
 /**
- * Copyright (c) 2020-2023 Gerhard Muth
+ * Copyright (c) 2020-2024 Gerhard Muth
  */
 
 import de.gmuth.ipp.core.IppTag.*
@@ -166,7 +166,7 @@ abstract class IppMessage() {
             throw IppException("No raw bytes to save. You must call read/decode or write/encode before.")
         } else {
             file.writeBytes(rawBytes!!)
-            logger.fine { "Saved ${file.path} (${file.length()} bytes)" }
+            logger.info { "Saved ${file.path} (${file.length()} bytes)" }
         }
 
     fun write(bufferedWriter: BufferedWriter, title: String? = null) {