RE: DNS Restart After ISA Server Reboot

From: "Thomas W Shinder" <tshinder@xxxxxxxxxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Date: Thu, 14 Aug 2003 01:49:38 -0500
Hey guys,
 
Call PSS for the latest rollup hotfix and all DNS problems will
disappear.
 
HTH,
Tom

Thomas W Shinder 
www.isaserver.org/shinder 
ISA Server and Beyond: http://tinyurl.com/1jq1 
Configuring ISA Server: http://tinyurl.com/1llp 

        -----Original Message-----
        From: William Robertson
[mailto:robertson.william@xxxxxxxxxxxxxx] 
        Sent: Thursday, August 14, 2003 1:21 AM
        To: [ISAserver.org Discussion List]
        Subject: [isalist] RE: DNS Restart After ISA Server Reboot
        
        
        http://www.ISAserver.org
        
        

        Hi Troy

         

        I have noticed the exact same problem/scenario but my solution
is not as proactive as yours. What I've also found is that even though
ISA Services have not been restarted, I will sometimes get a DNS
failure. I thus scheduled a VB Script to restart DNS on my DC's once a
day, but even that sometimes isn't good enough.

         

        Would you mind sharing your "polling script" with the rest of us
mortals so that we may also implement a more effective solution?

         

        Thanks

        William R.

         

        -----Original Message-----
        From: Troy Robbins [mailto:trobbins@xxxxxxxxxxxxx] 
        Sent: 14 August 2003 08:10 AM
        To: [ISAserver.org Discussion List]
        Subject: [isalist] RE: DNS Restart After ISA Server Reboot

         

        http://www.ISAserver.org

        Mark,

         

        We encountered a similar problem under the following conditions:

        - upon reboot of the ISA server 

        - restart of the ISA services 

        - external DNS failure from our ISP

         

        After spending time attempting to troubleshoot any issue that
was going on with DNS or ISA, the workaround I came up with was to
create a script that polls an external FQDN with more than one DNS
server, the script then parses the results and counts the DNS servers
returned, if the result is not what was expected the script restarts the
local DNS service (logs an event) and rechecks the results again. If the
script returned bad results the 2nd pass through a notification event is
fired off as well (i.e. email, MS Messenger Service, log file and event
log). The script keeps a tally of the total failures and will stop after
the 3rd attempted restart of the DNS service - notifying us that human
intervention is required. We use the script on all of our internal DNS
servers (5) and its executed every 4 minutes. On average the DNS service
is restarted a couple times every other day, very seldom have we had to
intervene - only when perhaps our external DNS servers were having
issues.

         

        While this obviously doesn't resolve the underlying problem,
it's certainly placed a Band-Aid on the issue and allowed us to move on
for the time being. If you like I can email the script to you off list.

         

        Troy Robbins, CISSP
RE: DNS Restart After ISA Server Reboot

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