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Strange FTP-Server Publishing Problem - 2.May2007 8:20:55 AM

dago10

Posts: 36
Joined: 24.Aug.2001
From: vienna, austria
Status: offline

Hi,

I have got a very strange problem with FTP-Server publishing. The FTP-Server is located in the perimeter network und I used the "Non-Web Server Protocol Publishing Wizard" to create the rule.

However, no EXTERNAL client can access the FTP-Server (clients in the internal LAN can access ist).

From the ISA-Server logging I learned that ISA server blocks this packet:
Client: FTP-Server, Source NW: Perimeter, Destination: External client, Destination Port: Upper port, e.g. 1480
Result Code: 0xc0040034 FWX_E_SEQ_ACK_MISMATCH
That is why the connection cannot be established.

For testing I transferred the FTP-Server to the internal network and everything works fine.

What is wrong here? The machine came with two onboard NICs, I added another one for the perimeter network. Maybe it is a problem with the NICs driver? I disabled all the "Offload..." settings in the NIC's settings.

Thank you for ANY help or suggestions!

Dagmar