Ok, so I have this problem within my organization that's got me baffled to no end. And, to be honest, I don't even no what to look at. So, this is the issue. At my organization, BEFORE I got there, when AD was implemented, for whatever reason, the internal domain name was created to be the same as the external domain name (mycompany.org). To be honest, I know I should probably know why that is an issue, but I don't, outside of the fact that I know it's best practice to make them different (i.e. internal = mycompany.local ; external = mycompany.org).
Ok, so on the point. for whatever reason, and not at any consistent time of day, etc., we are unable to connect to our external domain website (mycompany.org), but any other website we can access. We assume that the issue may be DNS related, but not sure how to check. And, if it isn't, what else could it be? And, if it is DNS related, why are we able to connect to any other (allowed) website with no issues, but not able to connect to our own? We have a "ping monitoring solution" (IPCheck and now PRTG) that we ping certain websites (besides of course our servers and network infrastructure), and when this issue happens, we get notified that our external website is not pingable. So, it's not pingable, nor is the website accessible ONLY FROM WITHIN OUR ORGANIZATION. If I were to ping the site (mycompany.org) or try to access it from my smartphone or from home, I can. I work at a financial institution and we have kiosk PCs for members to use and if they can't access their acct from our website when they come in, that obviously has a negative impact on our member service.
Can someone please provide some direction on what to check? And, I have to be honest, this has been going on for 3-4yrs (at least) and to this point, we haven't been able to figure out the issue. And, for most of the day, our site is accessible, but for maybe 3-4 times a week, from anywhere to 30mins to 1-2hrs, our site isn't accessible. And, it of course doesn't matter what browser is being used.
Let me know if you need anything further.