Recently installed a new firewall/managed switch combo for a branch site. They use DHCP/DNS provided by the firewall which specifies a primary DNS as internal (located at main site using MPLS) and a secondary DNS as external. Ever since this cutover, these clients have had issues where one or more times a day, they attempt to reach an internal website via a shortcut on their desktop that is browsed to by DNS name and it errors out as unreachable. I check connectivity with ping, tracert, nslookup to ensure DNS is configured properly and choosing the right server. I did some captures of traffic and the captures show that the client is able to send requests to the DNS server and they are working properly, yet, for whatever reason browsing to the internal website specifically does not work. There are multiple other branch offices with the same configuration, yet, for some reason this one is not working. I have checked the host files, I have checked DNS and WINS settings, I have checked on the firewall and contacted support, yet, everyone seems to be baffled by the behavior.
Any suggestions or ideas?
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