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Cisco ASA incoming FTP connections problem when "inspect" IS enabled.

Posted on 2008-06-16
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Last Modified: 2008-09-27
Hi All.

We have a Cisco ASA 5505 providing security for 2x servers in a data-centre. The servers behind the firewall both host FTP servers of their own and connect outbound to other FTP servers.

First problem we had was FTP from the internet to the servers was not working. We got rid of the "inspect ftp" statement - and all was fine. This unfortunatly causes problems with FTP connects these servers make to other servers out on the internet.

Any advise would be apprechiated.


Cheers,
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Question by:SynergyWorks
7 Comments
 

Author Comment

by:SynergyWorks
ID: 21793240
Hi.

I have re-enabled inspect FTP and this gives me working FTP out to the internet... and allows clients to connect to our servers using active FTP only. Passive fails.

How the heck do we get passive to go through this ASA 5505? I have enabed the FTP servet to use Passive ports 32000 > 33000 and forwarded these in the ASA.


Cheers,

Rob
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Expert Comment

by:2PiFL
ID: 21793336
In addition to the above;

(config)#ftp mode passive
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Author Comment

by:SynergyWorks
ID: 21793349
ftp mode passive is already present :(

Note: If I remove the 'inspect ftp' statement - all works fine (Passive & Active) but the servers then can't access other FTP sites out on the internet. It fails at the port command.
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Expert Comment

by:naughton
ID: 21797248
have you permitted both ftp and ftp-data into the firewall>
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Author Comment

by:SynergyWorks
ID: 21797257
Yup.

If I remove "inspect ftp" statement... all works fine... (passive and active ftp to our server) but I need to keep that statement so us downloading things from the internet (ISO mirrors etc) still works.


Cheers,
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LVL 1

Expert Comment

by:bkrontz
ID: 22239879
I'm having the same issues. Ugh.
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Accepted Solution

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SynergyWorks earned 0 total points
ID: 22538529
For us a change of FTP server software seemed to work. I guess it was crap software not doing what it should and upsetting the firewall.
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PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

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