gatekeeper:/var/log # grep -c "Broken pipe" /var/log/http.log
112
gatekeeper:/var/log # grep -c Timeout /var/log/http.log
316
Here are a few lines from the http.log also
cat http.log |grep "Broken pipe"
2013:01:24-16:40:00 gatekeeper httpproxy[32708]: id="0002" severity="info" sys="SecureWeb" sub="http" name="web request blocked" action="block" method="GET" srcip="192.168.0.11" dstip="173.194.43.37" user="" statuscode="502" cached="0" profile="REF_DefaultHTTPProfile (Default Proxy)" filteraction="REF_DefaultHTTPCFFAction (Default content filter action)" size="0" request="0x9e71ae0" url="http://i1.ytimg.com/vi/0pcUEKIthoU/default.jpg" exceptions="av" error="Broken pipe" country="United States" category="177" reputation="unverified" categoryname="Content Server" content-type="image/jpeg" application="youtube"
2013:01:24-16:40:00 gatekeeper httpproxy[32708]: id="0003" severity="info" sys="SecureWeb" sub="http" request="0x9b63860" function="tunnel_response_send_chunk" file="tunnel.c" line="265" message="write: Broken pipe"
2013:01:24-16:40:00 gatekeeper httpproxy[32708]: id="0002" severity="info" sys="SecureWeb" sub="http" name="web request blocked" action="block" method="GET" srcip="192.168.0.11" dstip="173.194.43.37" user="" statuscode="502" cached="0" profile="REF_DefaultHTTPProfile (Default Proxy)" filteraction="REF_DefaultHTTPCFFAction (Default content filter action)" size="2586" request="0x9b63860" url="http://i2.ytimg.com/vi/98mCq7CbZvU/mqdefault.jpg" exceptions="av" error="Broken pipe" country="United States" category="177" reputation="unverified" categoryname="Content Server" content-type="image/jpeg" application="youtube"
and the timeouts
2013:01:24-10:21:23 gatekeeper httpproxy[12146]: id="0002" severity="info" sys="SecureWeb" sub="http" name="web request blocked" action="block" method="POST" srcip="192.168.0.11" dstip="207.46.125.65" user="" statuscode="504" cached="0" profile="REF_DefaultHTTPProfile (Default Proxy)" filteraction="REF_DefaultHTTPCFFAction (Default content filter action)" size="2476" request="0x9346510" url="http://by2msg4020818.gateway.messenger.live.com/gateway/gateway.dll?Action=poll&Lifespan=60&SessionID=1046072096.996363977" exceptions="av,content,url,mime,fileextension" error="Timeout while reading response from Server"
All the timeouts are on the same live.com server so the server maybe down.
Regards
Bill