diff --git a/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties b/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties
index 514e11c..45021e8 100644
--- a/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties
+++ b/org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties
@@ -339,6 +339,7 @@
 newlineInQuotesNotAllowed=Newline in quotes not allowed
 noApplyInDelete=No apply in delete
 noClosingBracket=No closing {0} found for {1} at index {2}.
+noCredentialsProvider=Authentication is required but no CredentialsProvider has been registered
 noHEADExistsAndNoExplicitStartingRevisionWasSpecified=No HEAD exists and no explicit starting revision was specified
 noHMACsupport=No {0} support: {1}
 noMergeBase=No merge base could be determined. Reason={0}. {1}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java
index 5d9524b..f2a1b94 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java
@@ -398,6 +398,7 @@ public static JGitText get() {
 	/***/ public String newlineInQuotesNotAllowed;
 	/***/ public String noApplyInDelete;
 	/***/ public String noClosingBracket;
+	/***/ public String noCredentialsProvider;
 	/***/ public String noHEADExistsAndNoExplicitStartingRevisionWasSpecified;
 	/***/ public String noHMACsupport;
 	/***/ public String noMergeBase;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/TransportHttp.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/TransportHttp.java
index c4a6bd9..0653790 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/TransportHttp.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/TransportHttp.java
@@ -497,6 +497,9 @@ private HttpConnection connect(final String service)
 						throw new TransportException(uri, MessageFormat.format(
 								JGitText.get().authenticationNotSupported, uri));
 					CredentialsProvider credentialsProvider = getCredentialsProvider();
+					if (credentialsProvider == null)
+						throw new TransportException(uri,
+								JGitText.get().noCredentialsProvider);
 					if (authAttempts > 1)
 						credentialsProvider.reset(uri);
 					if (3 < authAttempts