diff --git a/setup.py b/setup.py
index a93da08..f345120 100755
--- a/setup.py
+++ b/setup.py
@@ -52,7 +52,7 @@ except:
 
 setuptools.setup(
         name='warcprox',
-        version='2.4b1.dev139',
+        version='2.4b1.dev143',
         description='WARC writing MITM HTTP/S proxy',
         url='https://github.com/internetarchive/warcprox',
         author='Noah Levitt',
diff --git a/warcprox/warc.py b/warcprox/warc.py
index 6b9cbcf..a929a73 100644
--- a/warcprox/warc.py
+++ b/warcprox/warc.py
@@ -1,23 +1,23 @@
-#
-# warcprox/warc.py - assembles warc records
-#
-# Copyright (C) 2013-2016 Internet Archive
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
-# USA.
-#
+'''
+warcprox/warc.py - assembles warc records
+
+Copyright (C) 2013-2018 Internet Archive
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+USA.
+'''
 
 from __future__ import absolute_import
 
@@ -140,6 +140,13 @@ class WarcRecordBuilder:
 
         return record
 
+    def _local_address(self):
+        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+        s.connect(('10.255.255.255', 1)) # ip doesn't need to be reachable
+        output = s.getsockname()[0]
+        s.close()
+        return output
+
     def build_warcinfo_record(self, filename):
         warc_record_date = warctools.warc.warc_datetime_str(datetime.datetime.utcnow())
         record_id = warctools.WarcRecord.random_warc_uuid()
@@ -154,7 +161,7 @@ class WarcRecordBuilder:
         warcinfo_fields.append(b'software: warcprox ' + warcprox.__version__.encode('latin1'))
         hostname = socket.gethostname()
         warcinfo_fields.append('hostname: {}'.format(hostname).encode('latin1'))
-        warcinfo_fields.append('ip: {}'.format(socket.gethostbyname(hostname)).encode('latin1'))
+        warcinfo_fields.append(('ip: %s' % self._local_address()).encode('latin1'))
         warcinfo_fields.append(b'format: WARC File Format 1.0')
         # warcinfo_fields.append('robots: ignore')
         # warcinfo_fields.append('description: {0}'.format(self.description))
diff --git a/warcprox/warcproxy.py b/warcprox/warcproxy.py
index 8850821..7ae5ab4 100644
--- a/warcprox/warcproxy.py
+++ b/warcprox/warcproxy.py
@@ -404,7 +404,8 @@ class SingleThreadedWarcProxy(http_server.HTTPServer, object):
 
         ca_name = ('Warcprox CA on %s' % socket.gethostname())[:64]
         self.ca = CertificateAuthority(
-                ca_file='warcprox-ca.pem', certs_dir='./warcprox-ca',
+                ca_file=options.cacert or 'warcprox-ca.pem',
+                certs_dir=options.certs_dir or './warcprox-ca',
                 ca_name=ca_name)
 
         self.recorded_url_q = warcprox.TimestampedQueue(
diff --git a/warcprox/writer.py b/warcprox/writer.py
index 56ff635..3fd6c7d 100644
--- a/warcprox/writer.py
+++ b/warcprox/writer.py
@@ -158,7 +158,6 @@ class WarcWriter:
 
         with self._lock:
             writer = self._writer()
-            recordset_offset = writer.tell()
 
             for record in records:
                 offset = writer.tell()
diff --git a/warcprox/writerthread.py b/warcprox/writerthread.py
index f823cc6..632ea2c 100644
--- a/warcprox/writerthread.py
+++ b/warcprox/writerthread.py
@@ -89,3 +89,7 @@ class WarcWriterThread(warcprox.BaseStandardPostfetchProcessor):
                 recorded_url.method, recorded_url.url.decode("utf-8"),
                 recorded_url.mimetype, recorded_url.size, payload_digest,
                 type_, filename, offset)
+
+    def _shutdown(self):
+        self.writer_pool.close_writers()
+