DNS & DHCP Issues

DNS Zone Transfer Error

Error: “The zone transfer was not executed. The zone type is invalid.”

Cause: Zone was created as secondary/stub instead of AD-integrated.

Solution:

# 1. Delete problematic zone on affected DC
# 2. Force AD replication
repadmin /syncall /AdeP

# 3. Restart DNS
Restart-Service DNS

# 4. Zone will reappear as AD-integrated

Client Shows Wrong DNS Suffix

Symptom: Client shows microsoftlab.ch instead of corp.microsoftlab.ch

Cause: Old DHCP lease before DNS domain was updated.

Solution:

ipconfig /release
ipconfig /renew

# Verify
ipconfig /all | Select-String "DNS Suffix"

Ping Not Working

Cause: Windows Firewall blocking ICMP for wrong profile.

Solution:

# Enable for ALL profiles
Set-NetFirewallRule -DisplayName "File and Printer Sharing (Echo Request - ICMPv4-In)" -Profile Any -Enabled True