Lesson Learned #495: Monitoring DNS Resolution with PowerShell of Azure SQL Server
Today, I worked on a service request where the DNS was providing an incorrect IP address randomly. In this article, I would like to share a PowerShell script that checks the DNS resolution every 5 seconds to help identify the issue.
Strange DNS problem on Server 2022
I installed a new Server 2022 DC on my network as the only DC. It serves DNS for our network and for a few weeks all has been working fine. However, lately I have been having a problem using Outlook to access my secondary email address at comcast.net. For long periods the attempt to download email fails. I did some checking and found that when I do a nslookup on imap.comcast.net I get this: Non-authoritative answer: Name: imap.comcast.net (note, there are no IP addresses) If I do the same but specify Google's DNS server (8.8.8.8) I get: Non-authoritative answer: Name: imap.ge.xfinity.com Addresses: 2001:558:fc0a:3:f816:3eff:fea5:2243 2001:558:fc0a:3:f816:3eff:fe95:679f 2001:558:fc0a:3:f816:3eff:fe0c:7c51 2001:558:fc0a:3:f816:3eff:fe51:b939 2001:558:fc0a:3:f816:3eff:fee8:1979 2001:558:fc0a:3:f816:3eff:fe6b:52a6 2001:558:fc0a:3:f816:3eff:fe5d:49ac 2001:558:fc0a:3:f816:3eff:fe84:7ff1 2001:558:fc0a:3:f816:3eff:fef5:7c75 2001:558:fc0a:3:f816:3eff:fe8d:2a36 2001:558:fc0a:3:f816:3eff:fe57:df5e 2001:558:fc11:9:f816:3eff:fee9:ffd6 2001:558:fc11:9:f816:3eff:fedd:4bc5 2001:558:fc11:9:f816:3eff:fe40:d128 2001:558:fc11:9:f816:3eff:fec1:ef59 2001:558:fc11:9:f816:3eff:fe48:d86d 96.118.18.255 96.118.18.251 96.118.18.249 96.118.18.240 96.118.18.254 96.118.17.101 96.118.17.82 96.118.18.242 96.118.19.1 96.118.19.5 96.118.18.230 96.118.17.194 96.118.18.11 96.118.19.0 96.116.224.191 96.116.224.174 Aliases: imap.comcast.netStep-by-Step: How to Configure a Private Endpoint to Secure Azure Static Web Apps
Learn how to secure your web apps with Azure Static Web Apps by configuring a private endpoint. This feature, also known as private link, allows developers to link network isolated backends for added security and seamless routing. This step-by-step guide explains the benefits and process of setting up a private endpoint in Azure Static Web Apps. Don't leave your web apps vulnerable, ensure their safety with a private endpoint.
