diff --git a/org.eclipse.jgit.test/tests.bzl b/org.eclipse.jgit.test/tests.bzl
index 3c42306db..637fe0c9c 100644
--- a/org.eclipse.jgit.test/tests.bzl
+++ b/org.eclipse.jgit.test/tests.bzl
@@ -33,6 +33,10 @@ def tests(tests):
       additional_deps = [
         '//lib:jsch',
       ]
+    if src.endswith("JschConfigSessionFactoryTest.java"):
+      additional_deps = [
+        '//lib:jsch',
+      ]
 
     junit_tests(
       name = name,
diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/JschConfigSessionFactoryTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/JschConfigSessionFactoryTest.java
new file mode 100644
index 000000000..acbc83343
--- /dev/null
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/JschConfigSessionFactoryTest.java
@@ -0,0 +1,216 @@
+/*
+ * Copyright (C) 2018, Thomas Wolf <thomas.wolf@paranor.ch>
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.eclipse.jgit.transport;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.File;
+import java.nio.file.Files;
+import java.util.Arrays;
+import java.util.concurrent.TimeUnit;
+
+import org.eclipse.jgit.util.FS;
+import org.junit.After;
+import org.junit.Test;
+
+import com.jcraft.jsch.Session;
+
+/**
+ * Tests for correctly interpreting ssh config values when Jsch sessions are
+ * used.
+ */
+public class JschConfigSessionFactoryTest {
+
+	File tmpConfigFile;
+
+	OpenSshConfig tmpConfig;
+
+	DefaultSshSessionFactory factory = new DefaultSshSessionFactory();
+
+	@After
+	public void removeTmpConfig() {
+		if (tmpConfigFile == null) {
+			return;
+		}
+		if (tmpConfigFile.exists() && !tmpConfigFile.delete()) {
+			tmpConfigFile.deleteOnExit();
+		}
+		tmpConfigFile = null;
+	}
+
+	@Test
+	public void testNoConfigEntry() throws Exception {
+		tmpConfigFile = File.createTempFile("jsch", "test");
+		tmpConfig = new OpenSshConfig(tmpConfigFile.getParentFile(),
+				tmpConfigFile);
+		factory.setConfig(tmpConfig);
+		Session session = createSession("ssh://egit/egit/egit");
+		assertEquals("egit", session.getHost());
+		// No user in URI, none in ssh config: default is OS user name
+		assertEquals(System.getProperty("user.name"), session.getUserName());
+		assertEquals(22, session.getPort());
+	}
+
+	@Test
+	public void testAlias() throws Exception {
+		tmpConfigFile = createConfig("Host egit", "Hostname git.eclipse.org",
+				"User foo", "Port 29418");
+		tmpConfig = new OpenSshConfig(tmpConfigFile.getParentFile(),
+				tmpConfigFile);
+		factory.setConfig(tmpConfig);
+		Session session = createSession("ssh://egit/egit/egit");
+		assertEquals("git.eclipse.org", session.getHost());
+		assertEquals("foo", session.getUserName());
+		assertEquals(29418, session.getPort());
+	}
+
+	@Test
+	public void testAliasWithUser() throws Exception {
+		tmpConfigFile = createConfig("Host egit", "Hostname git.eclipse.org",
+				"User foo", "Port 29418");
+		tmpConfig = new OpenSshConfig(tmpConfigFile.getParentFile(),
+				tmpConfigFile);
+		factory.setConfig(tmpConfig);
+		Session session = createSession("ssh://bar@egit/egit/egit");
+		assertEquals("git.eclipse.org", session.getHost());
+		assertEquals("bar", session.getUserName());
+		assertEquals(29418, session.getPort());
+	}
+
+	@Test
+	public void testAliasWithPort() throws Exception {
+		tmpConfigFile = createConfig("Host egit", "Hostname git.eclipse.org",
+				"User foo", "Port 29418");
+		tmpConfig = new OpenSshConfig(tmpConfigFile.getParentFile(),
+				tmpConfigFile);
+		factory.setConfig(tmpConfig);
+		Session session = createSession("ssh://bar@egit:22/egit/egit");
+		assertEquals("git.eclipse.org", session.getHost());
+		assertEquals("bar", session.getUserName());
+		assertEquals(22, session.getPort());
+	}
+
+	@Test
+	public void testAliasIdentical() throws Exception {
+		tmpConfigFile = createConfig("Host git.eclipse.org",
+				"Hostname git.eclipse.org", "User foo", "Port 29418");
+		tmpConfig = new OpenSshConfig(tmpConfigFile.getParentFile(),
+				tmpConfigFile);
+		factory.setConfig(tmpConfig);
+		Session session = createSession("ssh://git.eclipse.org/egit/egit");
+		assertEquals("git.eclipse.org", session.getHost());
+		assertEquals("foo", session.getUserName());
+		assertEquals(29418, session.getPort());
+	}
+
+	@Test
+	public void testAliasIdenticalWithUser() throws Exception {
+		tmpConfigFile = createConfig("Host git.eclipse.org",
+				"Hostname git.eclipse.org", "User foo", "Port 29418");
+		tmpConfig = new OpenSshConfig(tmpConfigFile.getParentFile(),
+				tmpConfigFile);
+		factory.setConfig(tmpConfig);
+		Session session = createSession("ssh://bar@git.eclipse.org/egit/egit");
+		assertEquals("git.eclipse.org", session.getHost());
+		assertEquals("bar", session.getUserName());
+		assertEquals(29418, session.getPort());
+	}
+
+	@Test
+	public void testAliasIdenticalWithPort() throws Exception {
+		tmpConfigFile = createConfig("Host git.eclipse.org",
+				"Hostname git.eclipse.org", "User foo", "Port 29418");
+		tmpConfig = new OpenSshConfig(tmpConfigFile.getParentFile(),
+				tmpConfigFile);
+		factory.setConfig(tmpConfig);
+		Session session = createSession(
+				"ssh://bar@git.eclipse.org:300/egit/egit");
+		assertEquals("git.eclipse.org", session.getHost());
+		assertEquals("bar", session.getUserName());
+		assertEquals(300, session.getPort());
+	}
+
+	@Test
+	public void testConnectTimout() throws Exception {
+		tmpConfigFile = createConfig("Host git.eclipse.org",
+				"Hostname git.eclipse.org", "User foo", "Port 29418",
+				"ConnectTimeout 10");
+		tmpConfig = new OpenSshConfig(tmpConfigFile.getParentFile(),
+				tmpConfigFile);
+		factory.setConfig(tmpConfig);
+		Session session = createSession("ssh://git.eclipse.org/something");
+		assertEquals("git.eclipse.org", session.getHost());
+		assertEquals("foo", session.getUserName());
+		assertEquals(29418, session.getPort());
+		assertEquals(TimeUnit.SECONDS.toMillis(10), session.getTimeout());
+	}
+
+	private File createConfig(String... lines) throws Exception {
+		File f = File.createTempFile("jsch", "test");
+		Files.write(f.toPath(), Arrays.asList(lines));
+		return f;
+	}
+
+	private Session createSession(String uriText) throws Exception {
+		// For this test to make sense, these few lines must correspond to the
+		// code in JschConfigSessionFactory.getSession(). Because of
+		// side-effects we cannot encapsulate that there properly and so we have
+		// to duplicate this bit here. We also can't test getSession() itself
+		// since it would try to actually connect to a server.
+		URIish uri = new URIish(uriText);
+		String host = uri.getHost();
+		String user = uri.getUser();
+		String password = uri.getPass();
+		int port = uri.getPort();
+		OpenSshConfig.Host hostConfig = tmpConfig.lookup(host);
+		host = hostConfig.getHostName();
+		if (port <= 0) {
+			port = hostConfig.getPort();
+		}
+		if (user == null) {
+			user = hostConfig.getUser();
+		}
+		return factory.createSession(null, FS.DETECTED, user, password, host,
+				port, hostConfig);
+	}
+}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/transport/JschConfigSessionFactory.java b/org.eclipse.jgit/src/org/eclipse/jgit/transport/JschConfigSessionFactory.java
index cdd39ccbf..a9296ae78 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/transport/JschConfigSessionFactory.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/transport/JschConfigSessionFactory.java
@@ -193,13 +193,18 @@ private static boolean isAuthenticationCanceled(JSchException e) {
 		return e.getCause() == null && e.getMessage().equals("Auth cancel"); //$NON-NLS-1$
 	}
 
-	private Session createSession(CredentialsProvider credentialsProvider,
+	// Package visibility for tests
+	Session createSession(CredentialsProvider credentialsProvider,
 			FS fs, String user, final String pass, String host, int port,
 			final OpenSshConfig.Host hc) throws JSchException {
 		final Session session = createSession(hc, user, host, port, fs);
 		// Jsch will have overridden the explicit user by the one from the SSH
 		// config file...
 		setUserName(session, user);
+		// Jsch will also have overridden the port.
+		if (port > 0 && port != session.getPort()) {
+			session.setPort(port);
+		}
 		// We retry already in getSession() method. JSch must not retry
 		// on its own.
 		session.setConfig("MaxAuthTries", "1"); //$NON-NLS-1$ //$NON-NLS-2$
@@ -477,4 +482,14 @@ public String[] getValues(String key) {
 			}
 		}
 	}
+
+	/**
+	 * Set the {@link OpenSshConfig} to use. Intended for use in tests.
+	 *
+	 * @param config
+	 *            to use
+	 */
+	void setConfig(OpenSshConfig config) {
+		this.config = config;
+	}
 }