View source for 480073 FSB Multiple Source DNS Issue

= Summary =
This bulletin outlines a DNS-handling issue affecting T10 units running APU software version <strong data-start="200" data-end="211">5.3.5.6</strong>. While the APU102 application correctly pushes DNS settings to the network adapter during network configuration, the Windows operating system may have already assigned DNS servers to the adapter.&nbsp; This results in DNS entries from both the DNS.DAT file on the APU and DNS servers appropriate for the open internet.
= Impact =
This will present to the user as the APU being unable to resolve URLs.
= Affected Products =
This issue affects APUs with T10 processors running application software version 5.3.5.6.
= Diagnosis =
'''Symptoms:'''
*Failed hostname lookups
*Failed server authentication
*Reporting/sync delays
*Loss of connectivity in DNS-required networks
'''Confirmation:'''
*At the APU Change prompt issue the following command
<code class="mwt-code" >SHELL IPCONFIG/ALL</code>
*The response should look like:
[[File:Screenshot 2025-11-13 143756.jpg|center]]
*Notice that the DNS Servers include 8.8.8.8 and 8.8.4.4.&nbsp; These were not in the DNS.DAT.
*The IPCONFIG utility shows the DNS errors.

= Mitigation =
The DNS servers can be updated manually.
== Remove DNS Servers ==

All DNS servers that are not desired must be removed.
*At the APU Change prompt issue the following command
*shell netsh interface ipv4 delete dnsservers "Ethernet" "dns-server-to-delete"
<code class="mwt-code">shell netsh interface ipv4 delete dnsservers "Ethernet" 8.8.8.8</code>

==Add DNS Servers==

All DNS servers that are not desired must be removed.
*At the APU Change prompt issue the following command
*shell netsh interface ipv4 add dnsservers "Ethernet" "dns-server-to-add"
<code class="mwt-code">shell netsh interface ipv4 add dnsservers Ethernet 8.8.8.8</code>
== Verification ==

*Roboot the APU
*Upon reboot, check the network settings
*If the network settings are not maintained, contact [[Comet Support]]

= Resolution =
Check future software release notes for improvements in DNS handling.