diff --git a/org.eclipse.jgit.ssh.jsch/src/org/eclipse/jgit/transport/JschConfigSessionFactory.java b/org.eclipse.jgit.ssh.jsch/src/org/eclipse/jgit/transport/JschConfigSessionFactory.java
index 88202dd..88b8243 100644
--- a/org.eclipse.jgit.ssh.jsch/src/org/eclipse/jgit/transport/JschConfigSessionFactory.java
+++ b/org.eclipse.jgit.ssh.jsch/src/org/eclipse/jgit/transport/JschConfigSessionFactory.java
@@ -40,6 +40,7 @@
 import org.eclipse.jgit.errors.TransportException;
 import org.eclipse.jgit.internal.transport.jsch.JSchText;
 import org.eclipse.jgit.util.FS;
+import org.eclipse.jgit.util.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -398,14 +399,26 @@ protected JSch getJSch(OpenSshConfig.Host hc, FS fs) throws JSchException {
 	 */
 	protected JSch createDefaultJSch(FS fs) throws JSchException {
 		final JSch jsch = new JSch();
-		JSch.setConfig("ssh-rsa", JSch.getConfig("signature.rsa")); //$NON-NLS-1$ //$NON-NLS-2$
-		JSch.setConfig("ssh-dss", JSch.getConfig("signature.dss")); //$NON-NLS-1$ //$NON-NLS-2$
+		// See https://bugs.eclipse.org/bugs/show_bug.cgi?id=537790 and
+		// https://bugs.eclipse.org/bugs/show_bug.cgi?id=576604
+		copyGlobalConfigIfNotSet("signature.rsa", "ssh-rsa"); //$NON-NLS-1$ //$NON-NLS-2$
+		copyGlobalConfigIfNotSet("signature.dss", "ssh-dss"); //$NON-NLS-1$ //$NON-NLS-2$
 		configureJSch(jsch);
 		knownHosts(jsch, fs);
 		identities(jsch, fs);
 		return jsch;
 	}
 
+	private void copyGlobalConfigIfNotSet(String from, String to) {
+		String toValue = JSch.getConfig(to);
+		if (StringUtils.isEmptyOrNull(toValue)) {
+			String fromValue = JSch.getConfig(from);
+			if (!StringUtils.isEmptyOrNull(fromValue)) {
+				JSch.setConfig(to, fromValue);
+			}
+		}
+	}
+
 	private static void knownHosts(JSch sch, FS fs) throws JSchException {
 		final File home = fs.userHome();
 		if (home == null)