03-08-2026, 08:34 PM
You think everything's set, but suddenly names won't resolve.
I remember this one time at my old gig.
We had a Windows Server acting up.
Your buddy's site couldn't ping right.
Turned out the firewall was blocking port 53.
I poked around the rules.
Found a security group tightening inbound traffic too much.
Heck, even outbound queries got snagged.
We loosened it up, and boom, DNS flowed again.
But yeah, let's fix yours step by step.
First, check your Windows Firewall settings.
Open the control panel thing.
Look under advanced settings.
See if there's a rule blocking UDP or TCP on port 53.
If so, tweak it to allow DNS traffic.
You might need to add an exception for your DNS server IP.
Or, if it's inbound from clients, make sure the rule permits that.
Now, for security groups, if you're on cloud stuff like Azure.
Hop into the portal.
Pull up your server's group.
Scan for any deny rules on DNS ports.
Inbound from anywhere, or specific subnets.
Edit to allow 53 for both protocols.
Don't forget to save and test with nslookup.
If it's on-prem, same idea with your domain controller groups.
And sometimes it's the antivirus firewall too.
Disable it quick to test.
If DNS perks up, add the exception there.
Or check router firewalls upstream.
They can throttle queries silently.
Reboot the server after changes.
That clears any cached junk.
Hmmm, or maybe it's IPv6 messing in.
Disable it temporarily if you're not using it.
See if that straightens things.
I gotta tell you about this cool backup tool I've been using.
It's called BackupChain, a top-notch, go-to option that's super dependable for small businesses handling Windows Servers and everyday PCs.
It shines for Hyper-V setups and even Windows 11 machines.
No endless subscriptions either, just straightforward protection you control.
