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05.07.2008 at 12:59PM PDT, ID: 23384095
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ASA5520 blocking ftp access to outside server for one workstation

Tags: Cisco, ASA5520, ASA5520
We ftp files to servers outside of our network.  Starting yesterday, our webmaster could no longer ftp to a server outside of our network.  He can ftp to a server within our network.  Other users can ftp to the outside servers.  I have concluded that he is being blocked by our ASA.  Here is one entry from the syslog: May  7 14:31:00 firewall %ASA-4-106023: Deny tcp src outside:2xx.xx.xx.1/21 (this is the outside ftp server) dst inside:2yy.yy.yy.83/1744 (this is his workstation using an address from my NAT pool) by access-group "outside_in.  When I remove "inspect ftp" from the ASA config, he can ftp.  Any ideas what could be causing this?
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Question Stats
Zone: Networking
Question Asked By: sjiinfosys
Solution Provided By: sjiinfosys
Participating Experts: 1
Solution Grade: A
Views: 0
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05.07.2008 at 02:23PM PDT, ID: 21520459

Rank: Sage

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05.07.2008 at 02:47PM PDT, ID: 21520623

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05.07.2008 at 02:55PM PDT, ID: 21520675

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05.09.2008 at 05:53AM PDT, ID: 21532233

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05.09.2008 at 06:30PM PDT, ID: 21537497

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05.07.2008 at 02:23PM PDT, ID: 21520459

Rank: Sage

Is the webmaster using passive or active FTP with his FTP client?  With the inspection enabled, I would have him/her try to FTP using the same method (client) that the other users who can still do it are using.  I'm thinking that the webmaster is possibly using active FTP and should use passive FTP instead....just a thought...
 
05.07.2008 at 02:47PM PDT, ID: 21520623
He gets blocked in both Filezilla and Windows XP command line, the same programs that work for the other user.  I too though it was an Active/Passive thing, so I had him try both with no luck.
 
05.07.2008 at 02:55PM PDT, ID: 21520675

Rank: Sage

Can you post your sanitized config so I can take a look?  Also, what is the IP address that the webmaster is using to ftp from?
 
05.09.2008 at 05:53AM PDT, ID: 21532233
Without making any changes to the ASA, things got worst.  When we arrived yesterday morning, no one could ftp to a computer outside of our company.  So, I did a "copy run start" and then "reload" on the ASA and ftp started working again.  I guess even Cisco equipment can benefit from an occasional reboot.
Accepted Solution
 
05.09.2008 at 06:30PM PDT, ID: 21537497

Rank: Sage

Excellent!  I seldom recommend to reboot a Cisco device, but I guess sometimes ya just gotta!  Glad you got it resolved...
 
 
20080236-EE-VQP-29 / EE_QW_2_20070628