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diff --git a/test/suite/test_readonly02.py b/test/suite/test_readonly02.py
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+#!/usr/bin/env python
+#
+# Public Domain 2016-2016 MongoDB, Inc.
+# Public Domain 2008-2016 WiredTiger, Inc.
+#
+# This is free and unencumbered software released into the public domain.
+#
+# Anyone is free to copy, modify, publish, use, compile, sell, or
+# distribute this software, either in source code form or as a compiled
+# binary, for any purpose, commercial or non-commercial, and by any
+# means.
+#
+# In jurisdictions that recognize copyright laws, the author or authors
+# of this software dedicate any and all copyright interest in the
+# software to the public domain. We make this dedication for the benefit
+# of the public at large and to the detriment of our heirs and
+# successors. We intend this dedication to be an overt act of
+# relinquishment in perpetuity of all present and future rights to this
+# software under copyright law.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+# OTHER DEALINGS IN THE SOFTWARE.
+#
+# test_readonly02.py
+#   Readonly: Test readonly mode with illegal config combinations
+#   and error checking during updates.
+#
+
+from helper import copy_wiredtiger_home
+from suite_subprocess import suite_subprocess
+import os, wiredtiger, wttest
+
+class test_readonly02(wttest.WiredTigerTestCase, suite_subprocess):
+    tablename = 'table:test_readonly02'
+    create = True
+    create_params = 'key_format=i,value_format=i'
+    entries = 10
+
+    conn_params = \
+        'create,statistics=(fast),log=(enabled,file_max=100K,zero_fill=true),'
+    conn_params_rd = \
+        'create,readonly=true,statistics=(fast),log=(enabled,zero_fill=false),'
+    conn_params_rdcfg = \
+        'create,readonly=true,statistics=(fast),log=(enabled),'
+
+    #
+    # Run to make sure incompatible configuration options return an error.
+    # The situations that cause failures (instead of silent overrides) are:
+    #   1. setting readonly on a new database directory
+    #   2. an unclean shutdown and reopening readonly
+    #   3. logging with zero-fill enabled and readonly
+    #
+    badcfg1 = 'log=(enabled,zero_fill=true)'
+
+    def setUpConnectionOpen(self, dir):
+        self.home = dir
+        rdonlydir = dir + '.rdonly'
+        #
+        # First time through check readonly on a non-existent database.
+        #
+        if self.create:
+            #   1. setting readonly on a new database directory
+            # Setting readonly prevents creation so we should see an
+            # error because the lock file does not exist.
+            msg = '/No such file/'
+            if os.name != 'posix':
+                msg = '/cannot find the file/'
+            os.mkdir(rdonlydir)
+            self.assertRaisesWithMessage(wiredtiger.WiredTigerError,
+                lambda: self.wiredtiger_open(
+                rdonlydir, self.conn_params_rd), msg)
+
+        self.create = False
+        conn = self.wiredtiger_open(dir, self.conn_params)
+        return conn
+
+    def check_unclean(self):
+        backup = "WT_COPYDIR"
+        copy_wiredtiger_home(self.home, backup, True)
+        msg = '/needs recovery/'
+        #   2. an unclean shutdown and reopening readonly
+        self.assertRaisesWithMessage(wiredtiger.WiredTigerError,
+            lambda: self.wiredtiger_open(backup, self.conn_params_rd), msg)
+
+    def close_checkerror(self, cfg):
+        ''' Close the connection and reopen readonly'''
+        #
+        # Close the original connection.  Reopen readonly and also with
+        # the given configuration string.
+        #
+        self.close_conn()
+        conn_params = self.conn_params_rd + cfg
+        msg = '/Invalid argument/'
+        self.assertRaisesWithMessage(wiredtiger.WiredTigerError,
+            lambda: self.wiredtiger_open(self.home, conn_params), msg)
+
+    def test_readonly(self):
+        tablearg = self.tablename
+        self.session.create(tablearg, self.create_params)
+        c = self.session.open_cursor(tablearg, None, None)
+        for i in range(self.entries):
+            c[i+1] = i % 255
+        # Check for an error on an unclean recovery/restart.
+        self.check_unclean()
+
+        # Close the connection.  Reopen readonly with other bad settings.
+        #   3. logging with zero-fill enabled and readonly
+        self.close_checkerror(self.badcfg1)
+
+if __name__ == '__main__':
+    wttest.run()