diff --git a/acme4j-client/src/main/java/org/shredzone/acme4j/connector/DefaultConnection.java b/acme4j-client/src/main/java/org/shredzone/acme4j/connector/DefaultConnection.java
index 7a99f366..fce470ef 100644
--- a/acme4j-client/src/main/java/org/shredzone/acme4j/connector/DefaultConnection.java
+++ b/acme4j-client/src/main/java/org/shredzone/acme4j/connector/DefaultConnection.java
@@ -106,11 +106,15 @@ public class DefaultConnection implements Connection {
 
             URL newNonceUrl = session.resourceUrl(Resource.NEW_NONCE);
 
+            LOG.debug("HEAD {}", newNonceUrl);
+
             conn = httpConnector.openConnection(newNonceUrl, session.getProxy());
             conn.setRequestMethod("HEAD");
             conn.setRequestProperty(ACCEPT_LANGUAGE_HEADER, session.getLocale().toLanguageTag());
             conn.connect();
 
+            logHeaders();
+
             int rc = conn.getResponseCode();
             if (rc != HttpURLConnection.HTTP_OK && rc != HttpURLConnection.HTTP_NO_CONTENT) {
                 throwAcmeException();
diff --git a/acme4j-client/src/test/java/org/shredzone/acme4j/connector/DefaultConnectionTest.java b/acme4j-client/src/test/java/org/shredzone/acme4j/connector/DefaultConnectionTest.java
index 277594c8..cf4fff67 100644
--- a/acme4j-client/src/test/java/org/shredzone/acme4j/connector/DefaultConnectionTest.java
+++ b/acme4j-client/src/test/java/org/shredzone/acme4j/connector/DefaultConnectionTest.java
@@ -188,6 +188,7 @@ public class DefaultConnectionTest {
         verify(mockUrlConnection, atLeastOnce()).connect();
         verify(mockUrlConnection, atLeastOnce()).getResponseCode();
         verify(mockUrlConnection, atLeastOnce()).getHeaderField("Replay-Nonce");
+        verify(mockUrlConnection, atLeastOnce()).getHeaderFields();
         verifyNoMoreInteractions(mockUrlConnection);
     }