RST instead of FIN with Windows XP SP2 Firewall

RST instead of FIN with Windows XP SP2 Firewall
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Subject Author Date
RST instead of FIN with Windows XP SP2 Firewall sfn 06-09-2005
Posted by sfn on June 9, 2005, 2:49 am
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Hello

I got an app which uses FTP from a WinXP Client to an RedHat62 Linux
Server.
Deactivating the FW of WinXP SP2 everything goes fine.
Activating the FW and setting this app as trusted, the FTP session
doesn't
work correctly.

The fine, but evident difference is, that on closing the FTP Session
(after transferring all the data)
the app sends [RST, ACK] with firewall acive
and [FIN, ACK] when firewall is off.
And sending [RST, ACK] doesn't close the session and it repeats
until app's timeout.

Using annother firewall like the "tiny" one, the were no problems.
But our customers could not change the FW , cause of their IT-Audits.

So I have to solve the problem.
Does anybody know why windows XP SP2 firewall does change this flag
from [FIN, ACK] to [RST, ACK] in the TCP/IP communication?

any advice is appreciated!

R.
SFN



Posted by Wolfgang Kueter on June 10, 2005, 1:33 am
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sfn wrote:


> Does anybody know why windows XP SP2 firewall does change this flag
> from [FIN, ACK] to [RST, ACK] in the TCP/IP communication?

The only ones who might know are the people who coded that and hold the
copyright on the code, so please discuss that with Microsoft.

Wolfgang



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