The next thing to do here is to remove the latest change (i.e., the last filter added) and see if ISA settles down. Those UDP:137 packet filter entries are nothing to worry about; just Windows trying to resolve names (UDP-137 is the NetBIOS name resolver). The fact that it's using source ports 1433 & 1434 is mere coincidence. I can't comment on the spoof attacks because you've chosen to obfuscate the log entries, but unless your ISP is using those IPs on routers, etc., then the spoof alert is likely true. Are you using those IPs internally? -----Original Message----- From: William Robertson [mailto:william.robertson@xxxxxxxxxx] Sent: Thursday, July 14, 2005 3:31 AM To: [ISAserver.org Discussion List] Subject: [isalist] Re: WEB Proxy service keeps restarting... http://www.ISAserver.org Sorry 'bout that Jim... got too excited with the Application logs.. :) Packet Filter log shows *many* of the following SPOOF attacks coming in via my external interface: 7/13/2005, 8:54:24, 172.16.115.38, <ISA_EXT_IF>, Tcp, 1360, 25, SYN , Spoof, 196.37.130.153, -, - 7/13/2005, 10:05:28, 172.25.24.81, <ISA_EXT_IF>, Tcp, 4163, 25, SYN , Spoof, 196.37.130.153, -, - Coupled with this, 90% of my Packet Filter logfile is made up of the following (SQL Slammer??) attacks? 7/13/2005, 10:05:24, <ISA_EXT_IF>, <INT_NETWORK_IP>, Udp, 1433, 137, -, BLOCKED, <ISA_EXT_IF>, -, - 7/13/2005, 10:05:24, <ISA_EXT_IF>, <INT_NETWORK_IP>, Udp, 1434, 137, -, BLOCKED, <ISA_EXT_IF>, -, - I have the following WEB Proxy plugins installed: - SurfControl WEBFilter v4.5.0.31 - ISA Monitor v1.3 As to when the problem started... hmmm.... difficult to say, but I know that I only installed the ISA Monitor fairly recently (like ~1-2 months ago), and this may coincide with the timing of the problem... I'm not sure. Anyone know of any issues with ISA Monitor? Thanks William R. -----Original Message----- From: Jim Harrison [mailto:Jim@xxxxxxxxxxxx] Sent: 13 July 2005 10:24 PM To: [ISAserver.org Discussion List] Subject: [isalist] Re: WEB Proxy service keeps restarting... http://www.ISAserver.org Hi Bill, ..and the rest of the questions? You can examine your packet filter logs to see where the spoof attack was seen. ------------------------------------------------------- Jim Harrison MCP(NT4, W2K), A+, Network+, PCG http://isaserver.org/Jim_Harrison/ http://isatools.org Read the help / books / articles! ------------------------------------------------------- -----Original Message----- From: William Robertson [mailto:william.robertson@xxxxxxxxxx] Sent: Wednesday, July 13, 2005 07:33 To: [ISAserver.org Discussion List] Subject: [isalist] Re: WEB Proxy service keeps restarting... http://www.ISAserver.org Thanks Jim. I have many (~600 today alone) of the following spoof attacks in my application log: Event ID: 15108 Date: 13/07/2005 Time: 08:54 Description: ISA Server detected a spoof attack from Internet Protocol (IP) address 172.16.115.38. A spoof attack occurs when an IP address that is not reachable via the interface on which the packet was received. If logging for dropped packets is set, you can view details in the packet filter log. And then shortly after I had this one: Event ID: 14079 Date: 13/07/2005 Time: 08:56 Description: Due to an unexpected error, the service w3proxy stopped responding to all requests. This occurred 2 time(s) in the past 20:18 hours. Try to stop the service or kill the corresponding process if it does not respond, and start it again. Check the Event Viewer for related error messages. And then when the service restarted itself, my cache was corrupt: Event ID: 14176 Date: 13/07/2005 Time: 08:56 Description: Disk cache E:\urlcache\dir1.cdat failed to initialize. Some errors were encountered when ISA Server restored specific data cache files. ISA Server will now attempt to recover these files. These errors may have occurred because there was not enough time to complete all necessary shutdown operations, when ISA Server was previously shut down. To avoid this in future, you can increase the value of the HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\WaitToKillServiceTim eout registry key. Identify the reason for cache failure by examining previous recorded events, or the error code. The error code in the Data area of the event properties indicates the cause of the failure (internal code: 503.6333.3.0.1200.166). I am extremely suspicious of all the spoof attacks, but they are on "private" IP addresses so I cannot figure where they are coming from. Surely not via my ISA'a external (public/routed) interface?? Thanks William R. -----Original Message----- From: Jim Harrison [mailto:Jim@xxxxxxxxxxxx] Sent: 12 July 2005 03:56 PM To: [ISAserver.org Discussion List] Subject: [isalist] Re: WEB Proxy service keeps restarting... http://www.ISAserver.org This is a bad suggestion. As Robert stated, SP2 includes this fix - if you try to reapply it, nothing will happen. ..now on to troubleshooting: 1. what additional ISA events are found in the System and Application event logs? 2. what traffic is found in the web proxy logs for that same time frame? 3. what web proxy plug-ins are you running? 4. when did this behavior start? --------------------------------------------------------------------- Everything in this e-mail and attachments relating to the official business of Columbus Stainless is proprietary to the company. It is confidential, legally privileged and protected by law. Columbus Stainless does not own and endorse any other content. 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It is confidential, legally privileged and protected by law. Columbus Stainless does not own and endorse any other content. Views and opinions are those of the sender unless clearly stated as being that of Columbus Stainless. The person addressed in the e-mail is the sole authorised recipient. Please notify the sender immediately if it has unintentionally reached you and do not read, disclose or use the content in any way. Whilst all reasonable steps are taken to ensure the accuracy and integrity of information and data transmitted electronically and to preserve the confidentiality thereof, no liability or responsibility whatsoever is accepted if information or data is, for whatever reason, corrupted or does not reach its intended destination. ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: World of Windows Networking: http://www.windowsnetworking.com Leading Network Software Directory: http://www.serverfiles.com No.1 Exchange Server Resource Site: http://www.msexchange.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: jim@xxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=isalist Report abuse to listadmin@xxxxxxxxxxxxx All mail to and from this domain is GFI-scanned.