I have a weird issue which started when I upgraded to version 6.15, I have tried downgrading and also upgrading to 6.17 no change.
I have a router which I am using for load balancing and default router for all my devices on my backbone and connected to my backbone.
Router ip 172.17.0.8/24
Backbone 172.17.0.0/24
I have a server lets call it DNS 172.17.0.123/24
I then have a number of routers at various points. The one I am behind 172.17.0.3/24. My computer is connected through a switch to this router on my_lan 172.17.8.1/24.
When I try and browse to do a dns query to 172.17.0.123 I get no response. If I do a continous ping to that server from my computer and run a dns query it works.
If I connect myself directly to the backbone network I can run dns query's, browse to the server remote desktop to it no issues. I have removed the firewall and antivirus as part of my test this has not improved anything. the only thing I have left to change is the router. As this is happening from my other 3 sites to this server I do not think is hardware issue but more likely an error in the router os. The configs on each of the routers is very simple. They are just connecting the 3 vlans behind them back to the backbone.
Anyone have any suggestions.