having the weirdest issue intermittently over the last 24 months... once a month between the hours of 8am-1pm. (basically 30 day gap between incident)
we have a DMZ with a Windows application proxy server on i, on prem we have an ADFS server to authenticate. however our external CRM site will go down - it will become unreachable -
we contacted our dns record host thinking it might be something on there end but they get 404 error when trying to connect to the site - so the site server is able to be contacted but nothing else works? when signed onto the WAP server you cant even connect to the crm server via browser. this lasts for 4 hours on the dot, then come right back up. this makes me think ARP, i am NOT a network guy, i know what arp is but have no arp experience. our entire network is 3-layer switches with the DMZ having its own 5port switch(which i have 0 details on)
you cannot connect to this site from external. internal works fine. while the issue is occurring.
we are still able to connect our webmail server and our RDgateway server, which route through the WAP server and authenticate via ADFS server. we tried changing our dns server from opendns to googledns and our own dns server, with no change.
ive dug through the WAS logs and the ADFS server and dont see anything weird. this is huge because all of our call center employees use crm.
any help is appreciated!
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