We have QuickBooks Enterprise 20.0 w/ Database Manager installed on a brand new server (on a domain) with IP address 10.10.10.30/24. The default gateway is the firewall at 10.10.10.1. End users are in 10.10.100.x/24 with their default gateway of 10.10.100.1 which is the firewall. The firewall is doing routing-on-a-stick with a downstream trunk port to a Cisco 3850. When the end user (not on a domain but soon to be) is in the same subnet as the servers it opens the company file fast (within 5 seconds) yet when the end user is in a different subnet it takes over 1-2 minutes to open the company file. What would be causing this? Another thing I could try to do is move the layer 3 routed interface down on the Cisco 3850 and see if it gives any different result.
Things I've tried/verified:
-network traffic is very low
-disabled all anti-virus
-disabled windows firewall
-made sure allow traffic between firewall zone are good
-made sure .nd file has correct server ip address
-folder permissions are good
-took wireshark packet captures (not seeing anything standing out)
