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ASA 5510 on FTP Downloads "The address translation slot was deleted."

Hi,

I am putting a ASA5510 in front of a ISA Server 2004 with Websense and having a problem with downloading anything via FTP.

Here are my test results:
1) When I go out through a PC directly to the ASA I can download FTP files and all other web content.
2) When I go out through a PC directly to the ISA then out to the internet everything works fine.
3) When I go out through a PC directly to the ISA then through the firewall I can't download FTP files. All other web content works fine.

I receive the following errors from Test 3):

On ASA:

6      Feb 27 2011      23:31:51            172.20.2.100      20699      173.71.64.133      1538      Teardown dynamic TCP translation from inside:172.20.2.100/20699 to FIOS:x.x.x.x(my public IP)/1538 duration 0:00:30

I'm doing NAT on my ASA and apparently on my ISA. I believe this is the issue. The ASA has a public IP. Between the inside ISA  port and outside ASA port I have a private nework with the range 172.20.2.x. The inside network where the PC's reside and inside port of the ISA are on 10.35.208.x
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First LastAuthor Commented:
Sorry - the ISA server is giving the following error on FTP downloads from IE:

ISA Server: extended error message :
200 Type set to I.
500 Illegal PORT Command

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torvirCommented:
You should try to turn on inspection of ftp-traffic in ASA.
If you have a global policy in tha ASA-config, just add "inspect ftp" to it.
Look for a command like "service-policy xxxx global" and add it there.

Here is how you add a global policy with ftp-inspection from scratch:

policy-map global_policy
 class inspection_default
  inspect ftp
service-policy global_policy global

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First LastAuthor Commented:
The Websense ISA Server isn't supposed to be inline with the Cisco ASA. I found this article below that describes how to use the url filtering feature of the ASA to reach out to Websense.
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