We have two networks, two separate domains connected via an MPLS connection. On either side of the network is an ASA firewall and on my side of the network this simply acts as a router sending all internal Internet traffic out to our ISP and all other traffic to the other network. Both networks carry the other sides DNS added locally as a secondary zone. On my side we push out a domain suffix list via group policy including both domains. Based on this we access a JDE ERP system in the second network and connect via IE over the MPLS to the servers in the second network.
The problem arrives with users on our network that has fixed IP addresses. At seemingly random intervals they lose connection to the ERP servers in the other network. This issue always resolves itself after a brief loss of connection but can happen several times a day or hour. When I look at these stations IP and DNS seem fine and I can resolve pings to the other network but cannot access the JDE servers. Users on DHCP are not affected.
This seems like a DNS issue but I am struggling to resolve it.
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