DNS issues on 2003 network

[thwr]

@JaredBusch said in DNS issues on 2003 network:

Re: Domain Controller Down (VM)

@wirestyle22 said in Domain Controller Down (VM):

Alright, so I'm going to need to fix some DNS issues which I think @JaredBusch informed me of yesterday. When I perform nslookup on my file server and printer server it kicks back an error stating:

DNS request timed out.
Default Server: Unknown
Address: 192.168.10.16 <-- IP of my domain controller (2003)

So log into your server and check the DNS service.

• DNS assigned to the clients IF?
• DNS running (see @JaredBusch's answer)
• DNS reachable (different subnet? Routes ok? Firewall? Can you ping it?)

[wirestyle22]

@JaredBusch

DNS Client is running
Can ping the domain controller

[scottalanmiller]

@wirestyle22 said in DNS issues on 2003 network:

@JaredBusch

DNS Client is running
Can ping the domain controller

What's a DNS Client? nslookup itself is the DNS client. It's the DNS service that you are looking for on the server.

[thwr]

@wirestyle22 said in DNS issues on 2003 network:

@JaredBusch

DNS Client is running
Can ping the domain controller

what about the server?

Simple check (on the server -> cmd.exe)

netstat -an | findstr /I "udp" | findstr "53"

[wirestyle22]

@thwr said in DNS issues on 2003 network:

netstat -an | findstr /I "udp" | findstr "53"

The only machines that aren't working are the file server and print server. Everything else connected correctly. Am I doing this on the domain controller or problem server?

[coliver]

@wirestyle22 said in DNS issues on 2003 network:

@thwr said in DNS issues on 2003 network:

netstat -an | findstr /I "udp" | findstr "53"

The only machines that aren't working are the file server and print server. Everything else connected correctly. Am I doing this on the domain controller or problem server?

On the problem server check and see if there are static DNS servers defined. That would be my guess.

[thwr]

@wirestyle22 said in DNS issues on 2003 network:

@thwr said in DNS issues on 2003 network:

netstat -an | findstr /I "udp" | findstr "53"

The only machines that aren't working are the file server and print server. Everything else connected correctly. Am I doing this on the domain controller or problem server?

This command just checks if there is something listening on UDP/53. 53 is the default DNS port, 99% of the DNS requests are served using UDP. Be aware, DNS CAN use TCP too. So yes, use that on your DNS server.

[wirestyle22]

@coliver said in DNS issues on 2003 network:

@wirestyle22 said in DNS issues on 2003 network:

@thwr said in DNS issues on 2003 network:

netstat -an | findstr /I "udp" | findstr "53"

The only machines that aren't working are the file server and print server. Everything else connected correctly. Am I doing this on the domain controller or problem server?

On the problem server check and see if there are static DNS servers defined. That would be my guess.

The IP's are correct

[thwr]

@wirestyle22 said in DNS issues on 2003 network:

@coliver said in DNS issues on 2003 network:

@wirestyle22 said in DNS issues on 2003 network:

@thwr said in DNS issues on 2003 network:

netstat -an | findstr /I "udp" | findstr "53"

The only machines that aren't working are the file server and print server. Everything else connected correctly. Am I doing this on the domain controller or problem server?

On the problem server check and see if there are static DNS servers defined. That would be my guess.

The IP's are correct

Erm, is the .16 a DNS? Same host?

[coliver]

@thwr said in DNS issues on 2003 network:

@wirestyle22 said in DNS issues on 2003 network:

@coliver said in DNS issues on 2003 network:

@wirestyle22 said in DNS issues on 2003 network:

@thwr said in DNS issues on 2003 network:

netstat -an | findstr /I "udp" | findstr "53"

The only machines that aren't working are the file server and print server. Everything else connected correctly. Am I doing this on the domain controller or problem server?

On the problem server check and see if there are static DNS servers defined. That would be my guess.

The IP's are correct

Erm, is the .16 a DNS? Same host?

I was going to say. Is this on the 2003 DC or the File server you are having issues with?

[thwr]

@coliver said in DNS issues on 2003 network:

@thwr said in DNS issues on 2003 network:

@wirestyle22 said in DNS issues on 2003 network:

@coliver said in DNS issues on 2003 network:

@wirestyle22 said in DNS issues on 2003 network:

@thwr said in DNS issues on 2003 network:

netstat -an | findstr /I "udp" | findstr "53"

The only machines that aren't working are the file server and print server. Everything else connected correctly. Am I doing this on the domain controller or problem server?

On the problem server check and see if there are static DNS servers defined. That would be my guess.

The IP's are correct

Erm, is the .16 a DNS? Same host?

I was going to say. Is this on the 2003 DC or the File server you are having issues with?

My guess is that the .16 is his file- or printserver, so one of the failing ones.

[BRRABill]

@coliver said in DNS issues on 2003 network:

@thwr said in DNS issues on 2003 network:

@wirestyle22 said in DNS issues on 2003 network:

@coliver said in DNS issues on 2003 network:

@wirestyle22 said in DNS issues on 2003 network:

@thwr said in DNS issues on 2003 network:

netstat -an | findstr /I "udp" | findstr "53"

The only machines that aren't working are the file server and print server. Everything else connected correctly. Am I doing this on the domain controller or problem server?

On the problem server check and see if there are static DNS servers defined. That would be my guess.

The IP's are correct

Erm, is the .16 a DNS? Same host?

I was going to say. Is this on the 2003 DC or the File server you are having issues with?

Assuming the DC since he said the DC was .16

[wirestyle22]

@thwr said in DNS issues on 2003 network:

@wirestyle22 said in DNS issues on 2003 network:

@coliver said in DNS issues on 2003 network:

@wirestyle22 said in DNS issues on 2003 network:

@thwr said in DNS issues on 2003 network:

netstat -an | findstr /I "udp" | findstr "53"

The only machines that aren't working are the file server and print server. Everything else connected correctly. Am I doing this on the domain controller or problem server?

On the problem server check and see if there are static DNS servers defined. That would be my guess.

The IP's are correct

Erm, is the .16 a DNS? Same host?

.16 is DNS. It's the domain controller

[wirestyle22]

@thwr said in DNS issues on 2003 network:

@wirestyle22 said in DNS issues on 2003 network:

@thwr said in DNS issues on 2003 network:

netstat -an | findstr /I "udp" | findstr "53"

The only machines that aren't working are the file server and print server. Everything else connected correctly. Am I doing this on the domain controller or problem server?

This command just checks if there is something listening on UDP/53. 53 is the default DNS port, 99% of the DNS requests are served using UDP. Be aware, DNS CAN use TCP too. So yes, use that on your DNS server.

[thwr]

@wirestyle22 said in DNS issues on 2003 network:

@thwr said in DNS issues on 2003 network:

@wirestyle22 said in DNS issues on 2003 network:

@thwr said in DNS issues on 2003 network:

netstat -an | findstr /I "udp" | findstr "53"

The only machines that aren't working are the file server and print server. Everything else connected correctly. Am I doing this on the domain controller or problem server?

This command just checks if there is something listening on UDP/53. 53 is the default DNS port, 99% of the DNS requests are served using UDP. Be aware, DNS CAN use TCP too. So yes, use that on your DNS server.

ok, looks good (second last row).

Could you just post a small list with IPs?

DC
Fileserver
Printserver

Are your subnet masks the same on every device?

[BRRABill]

@wirestyle22

Can you post the TCP/IP settings from the machine you are having an issue with?

[coliver]

@wirestyle22 said in DNS issues on 2003 network:

@thwr said in DNS issues on 2003 network:

@wirestyle22 said in DNS issues on 2003 network:

@coliver said in DNS issues on 2003 network:

@wirestyle22 said in DNS issues on 2003 network:

@thwr said in DNS issues on 2003 network:

netstat -an | findstr /I "udp" | findstr "53"

The only machines that aren't working are the file server and print server. Everything else connected correctly. Am I doing this on the domain controller or problem server?

On the problem server check and see if there are static DNS servers defined. That would be my guess.

The IP's are correct

Erm, is the .16 a DNS? Same host?

.16 is DNS. It's the domain controller

Good to know. How about the configuration of the problem servers.

[wirestyle22]

@BRRABill said in DNS issues on 2003 network:

@wirestyle22

Can you post the TCP/IP settings from the machine you are having an issue with?

File Server

Print Server

[coliver]

@wirestyle22 said in DNS issues on 2003 network:

@BRRABill said in DNS issues on 2003 network:

@wirestyle22

Can you post the TCP/IP settings from the machine you are having an issue with?

File Server

Print Server

Need the DNS data ipconfig /all or go through the details pane like you did previously.

[BRRABill]

@wirestyle22

Sorry, I mean the same screenshot as you posted for the DC.