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This problem started with 17.5.0 GA. The firewall is handling DHCP for my lan. Users have started to lose the default gateway(the Firewall) randomly throughout the day. I have to either reset the switch or the desktop network adapter in order to regain internet connectivity. This does NOT happen to all users at the same time.
I updated to XG 115 SFOS 17.5.5 MR5 but the problem still exists. This actually introduced another problem of not being able to access the gui from Sophos Central, but that's not as pressing. Any thoughts on this would be appreciated.
In reply to Tibor Soós:
Just curious. What version of Hyper-V (on server 2019 by chance ?) and which intel adapter ?
In reply to Big_Buck:
it was on Windows 10 1903 and had 3 adapters. If I just remeber correctly perhaps it is get wrong after the upgrade. Till then it was fine.
Realtek Gbit Ethernet adapter - this was the WAN port
TP-LINK Gigabit PCi Express dapter - this was the LAN port
ASIX AX88179 USB 3.0 to Gigabit Ethernet Adapter - this was the Public Wifi port
Hyper-V configuration version 8.0
For me the resolution was to install the latest firewall firmware to Intel HW: https://ark.intel.com/content/www/us/en/ark/products/42408/intel-desktop-board-dh55tc.html
and added to PCIe cards: TP-LINK Gigabit PCi Express dapter and Samsung 120GB SSD
on this HW the issue is not present. everything is fast and working well.
Realtek uses their own silicon. TPlink were using Intel at a point of time. And I have no clue what ASIX is using.
You could you use a dual port or even quad ethernet adapter in PCIe 1X. Depending on the motherboard you are using, it may not be possible to use 4, 8 or 16 lanes ... That said, dual or even quad ports are very cheap on e-Bay.