I've a NAI e250 Viruswall right in front of the BM37 to filter all
Internet traffic like HTTP, HTTPS, SMTP, FTP etc.

There is an AS400 in the DMZ for our customers use.

Till now, there was no NAT activated.
To make HTTPS working on the internal NAI box, i have to enable NAT.

But when NAT is enabled, no matter if dynamic or static NAT if activeit's not possible to ping any machine in the DMZ.
All the rest is working fine.

Has anyone any suggestion?