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Cisco ASA and Microsoft TMG Back to Back Issue

Posted on 2014-03-03
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Last Modified: 2014-03-30
Hello Experts,

I have weird issue.

I have a Cisco ASA 5540 with 4 interfaces Outside,Inside, DMZ, TMG ( back to Back).

I have Microsoft TMG with 2 NICs. Internal Interface connected to Inside Switch and External directly connected to ASA TMG interface (Gi0/3).

I have default gateway on external interface pointing to ASA.

We are using TMG only as Web Proxy. Very often I start receiving call from user that cannot browse internet and they receive TMG error page.

When we move to TMG to diagnose the issue, we came to know that TMG cannot ping IP of ASA interface ( Gi0/3- Default of gateway TMG. In order to resolve this issue I have to reboot to the ASA.

Please can someone help to resolve this issue.

Thanks
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Question by:cciedreamer
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Expert Comment

by:Craig Beck
ID: 39902916
Hi Samir,

Can you do some debugging on the ASA?  The logs should be able to give you some clues if you check at around the time the issue started to happen.
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Author Comment

by:cciedreamer
ID: 39902951
Hi Sir,

How are you ? Hope all is well.

Any important debug command to start with ?

Thanks
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Accepted Solution

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Craig Beck earned 500 total points
ID: 39903011
I'm good thanks, Samir, hope you are well :-)

I'd just take some traffic logs at the time you stop being able to pass traffic through the ASA.  You might be able to see something being blocked.

Do you have any IDS or IPS running?
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Author Comment

by:cciedreamer
ID: 39903016
Yes  We have IPS and module installed on ASA ?
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Author Comment

by:cciedreamer
ID: 39949878
I am just waiting to let issue appear again.

Thanks
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LVL 3

Author Comment

by:cciedreamer
ID: 39964837
Thanks Sir,

Issue Resolved. ASA was putting the TMG server into shunned mode

I entered no shun command on ASA

I have no idea why ASA putting TMG server into shun mode.
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