Some more information for future folks that see this - "Secure efi boot"
was the issue. Disabling secure boot allowed it to PXE successfully.

On Thu, Mar 18, 2021 at 12:53 PM Russell Jones <arjone...@gmail.com> wrote:

> Brand new xcat management server running CentOS 8.3. I've searched high
> and low and cannot figure out why I am getting the following error when I
> try to PXE boot a node:
>
> Mar 18 12:49:12 xcat8 in.tftpd[2962]: RRQ from 172.21.4.1 filename
> xcat/xnba.efi
> *Mar 18 12:49:12 xcat8 in.tftpd[2962]: tftpd: read: Connection refused*
> Mar 18 12:49:16 xcat8 in.tftpd[2963]: RRQ from 172.21.4.1 filename
> xcat/xnba.efi
> Mar 18 12:49:16 xcat8 in.tftpd[2963]: Client 172.21.4.1 finished
> xcat/xnba.efi
>
>
> Any assistance in troubleshooting is appreciated! The xcatprobe check
> returns good except for DNS (expected, we host DNS off the management node).
>
> =================================== SUMMARY
> ====================================
> [MN]: Checking on MN...
>                                         [FAIL]
>     Checking DNS service is configured...
>                                         [FAIL]
>         DNS service isn't ready on 172.21.0.103
>
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