Time: 11/14/2013 0:47:26
Message: AutoUpdate finished
Module: SophosUpdate
Process ID: 944
Thread ID: 736
Time: 11/14/2013 0:47:26
Message: Downloading phase completed
Module: Update
Process ID: 944
Thread ID: 736
Time: 11/14/2013 0:47:26
Message: ERROR: Download of Endpoint Security and Control failed from server Sophos
Module: Update
Process ID: 944
Thread ID: 736
Time: 11/14/2013 0:46:20
Message: Downloading product Endpoint Security and Control from server Sophos
Module: Update
Process ID: 944
Thread ID: 736
Time: 11/14/2013 0:46:05
Message: *************** Sophos AutoUpdate started ***************
Module: SophosUpdate
Process ID: 944
Thread ID: 736
At the same time, I started receiving IPS notifications from the firewall:
2013:11:14-00:46:35 astaro snort[15096]: id="2101" severity="warn" sys="SecureNet" sub="ips" name="Intrusion protection alert" action="drop" reason="FILE-PDF Microsoft Windows kernel-mode drivers core font parsing integer overflow attempt" group="110" srcip="63.239.232.59" dstip="192.168.0.14" proto="6" srcport="80" dstport="64343" sid="24507" class="Attempted Administrator Privilege Gain" priority="1" generator="1" msgid="0"
2013:11:14-00:47:07 astaro snort[15096]: id="2101" severity="warn" sys="SecureNet" sub="ips" name="Intrusion protection alert" action="drop" reason="FILE-PDF Microsoft Windows kernel-mode drivers core font parsing integer overflow attempt" group="110" srcip="209.8.115.136" dstip="192.168.0.14" proto="6" srcport="80" dstport="64468" sid="24507" class="Attempted Administrator Privilege Gain" priority="1" generator="1" msgid="0"
Eventually I put 2 and 2 together and realized that Sophos' own UTM was causing the problem with the downloads. Specifically Snort rule 24507. After creating an exception to log and report that rule instead of dropping, the updates are now working again.
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