InfoHub
PDF

Bind9 Unit - Disable port 53 on the GLServer host

By EssingtonITS team ·

Issue

When running the GLServer bind 9 unit the unit fails to start due to a conflicting DNS port (53) Confirm port 53 is in use by the local DNSresolver service with the following command lsof -i :53 which will produce output similar to the following COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME systemd-r 1051 systemd-resolve 12u IPv4 25710 0t0 UDP localhost:domain systemd-r 1051 systemd-resolve 13u IPv4 25711 0t0 TCP localhost:domain (LISTEN)

Solution

Edit the following

/etc/systemd/resolved.conf

The file contents should replicate the following

[Resolve]
DNS=127.0.0.1
#FallbackDNS=
#Domains=
#LLMNR=no
#MulticastDNS=no
#DNSSEC=no
#Cache=yes
DNSStubListener=no

Create a sym link to the resolve.conf file

ln -sf /run/systemd/resolve/resolv.conf /etc/resolv.conf

Restart the resolved service

systemctl daemon-reload
systemctl restart systemd-resolved.service

Test port 53 is no longer in use using the following command

lsof -i :53

If successful no output will be produced you can now restart the unit

gl -s bind9-unit-name

Managing modern applications across servers, networks, and environments can quickly become complex and costly.

EssingtonITS GL Server is a powerful platform designed to simplify the deployment and management of containerised application Units. Whether running a single server or a large multi-environment infrastructure, GL Server helps organisations deliver secure, scalable, and resilient services without requiring in-house DevOps expertise.

person people found this useful.

Related

Knowledge base 16 Oct 2026

Building a Windows 11 gold template

Learn how to create a Windows 11 gold template in Proxmox for VDI environments, allowing for efficient desktop pool management. This guide is aimed at engineers and includes steps for setting up, configuring, and testing the template.
Knowledge base 10 Oct 2026

eLLA - Settings, Options and Skills Reference

eLLA is a command-line assistant for system administration. It connects to an eLLM endpoint (any OpenAI-compatible API with tool calling), runs read-only diagnostics on its own, and asks for approval before it changes anything. This article lists every setting, command, option and bundled skill.
Knowledge base 23 Sep 2026

eSAM and exam regulations

eSAM addresses every requirement in JCQ Appendix 1 that software can address. The rest, who is sitting there, how the room is laid out, how many invigilators are watching stay with the centre, and eSAM tells you exactly which those are.
Expand 29 Jul 2026

How AI can support pupils with SEND

Explore how AI tools are aiding pupils with special educational needs and disabilities by simplifying text, breaking down tasks, and enhancing accessibility. Learn about the considerations schools should make before implementation.
Expand 29 Jul 2026

AI policy and practice in further education

Further education colleges need distinct AI policies due to their unique mix of vocational courses, diverse age groups, and specific funding and inspection requirements. This guidance highlights the importance of tailored AI approaches in FE settings.