Hello,

We seem to have two different clients suffering from the issue described in this Microsoft KB article.

http://support.microsoft.com/kb/2862523

One is using a Vigor 2830 and the other a Vigor 2910.

Firmwares are up to date, but I can't find the SPI settings, any ideas?

Personal never changed the default settings of the firewall,but here few links to keep you going until some else reply
http://www.draytek.co.uk/archive/kb_vigor_spi.html
http://www.draytek.com/index.php?option=com_k2&view=item&id=1837&Itemid=293&lang=en

EDIT
I think with older firmwares was built in at Firewall >> General Setup
i would say to try at Firewall >> General Setup >> to untick Enable Strict Security Firewall or tick enable ipv4 routing packets for ipv4
(based with firmware 3.6.7)

Hi babis3g,

Thanks for your suggestions, unfortunately I already have strict firewall disabled

Nothing really useful in those other pages other then on Drayteks SPI is called "Keep state".

if no one reply email the support, older models had it located at firewall, maybe they will be able to tell you where is located or with an other similar action