Troubleshooting DNS Problems in an Exchange Environment

DNS is often considered a “black box” in the sense that once you have it configured and working, it’s very hard to figure out why it breaks. Yet the health of your Exchange environment is tied to the health of your network’s DNS operations. There are three classes of DNS problems that can adversely affect Exchange: overall connectivity between Exchange servers and DNS servers, overall performance of DNS servers, and the DNS servers’ integrity—that is, the optimal configuration from both a technical and best-practices standpoint. Every DNS problem you encounter should fall into one of these categories. I’ll provide an in-depth look at DNS, its core components, and the approach you should take when troubleshooting specific classes of issues. Understanding the different classes of DNS issues and the troubleshooting process required to approach a specific type of issue will demystify DNS so that it’s no longer the black box it typically is for Exchange administrators. I’ll begin by looking at DNS’s related connectivity and performance issues, and in an upcoming article, I’ll explore DNS integrity. . . .