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Cisco ASA 5520 SSM-CSC-10 trend micro interscan: 503 Service Unavailable Error

Hi everybody!

I constantly receive the following error accessing http://www.ameren.com wesite:

____________________________________________________

503 Service Unavailable

Unable to connect to

192.104.244.73

____________________________________________________

I added IP and URL in all exception lists on content filter, but error still persists.

Web site opens normally from non filtered network.

Any suggestions? What may be the cause?

Please HELP the case is urgent

Thanks in advance

A.

PS Debug info

ASA info

In our org we use Cisco ASA 5520, SSM-SCS-10 device

Cisco Adaptive Security Appliance Software Version 8.4(2) (asa842-k8.bin)

Platform has an ASA 5520 VPN Plus license

CSC-SSM info

Trend Micro InterScan for Cisco CSC SSM 6.6.1125.0

Plus license for InterScan for CSC SSM

TCP stream capture from Wireshark:

GET / HTTP/1.1

Host: ameren.com

User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8

Accept-Language: en-us,en;q=0.5

Accept-Encoding: gzip, deflate

Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7

DNT: 1

Connection: keep-alive

HTTP/1.1 503 Service Unavailable

Proxy-Agent: CSCSSM

Content-Type: text/html; charset=UTF-8

Cache-Control: no-cache

Date: Wed, 02 Nov 2011 07:22:25 GMT

<TITLE>503 Service Unavailable</TITLE>

<H1>503 Service Unavailable</H1>

Unable to connect to <B>192.104.244.73</B>.

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