Core switch fails to obtain DHCP after restarting

Jun 06, 2026

Network Switch Troubleshooting Guide: Common Problems and

A comprehensive switch troubleshooting from the physical layer to the data link layer to the network layer to find out why your network switch is not working.

Nov 10, 2025

DHCP Server failing after every reboot of switch (SG350-10P)

Hello Community! With little experience in networks I am trying to run the DHCP server functionality on a SG350-10P switch in a simplified testing environment (only two network clients

Apr 24, 2026

Unifi Network not working with DHCP

We''ve been facing a very strange DHCP issue across a medium-sized UniFi deployment (10+ APs and about 20 switches) where Wi-Fi clients

Dec 11, 2025

Troubleshooting DHCP Issues: Receiving Addresses via DHCP

Having trouble receiving IP addresses through DHCP? This article provides solutions and troubleshooting tips for when your devices fail to obtain addresses automatically. Explore common

Apr 21, 2026

Troubleshooting guide for Dynamic Host Configuration Protocol (DHCP

For more information, see the following Knowledge Base article: 220874 How to use automatic TCP/IP addressing without a DHCP server All communication is done on UDP ports 67

Jun 02, 2026

Fix Unable to contact your DHCP Server error on

Restart the system once done. Read: How to fix DHCP Lookup Failed. 3] Disable IPv6 on the connection which is active At times, if IPv6 is enabled for

Feb 15, 2026

Troubleshoot problems on the DHCP server | Microsoft Learn

Ajuda a resolver o problema em que o servidor DHCP (Dynamic Host Configuration Protocol) responde atrasado ou não responde a solicitações DHCP, mesmo que o volume de

Mar 05, 2026

Troubleshooting DHCP

Troubleshooting DHCP is normally pretty straight forward. Most issues are related to configuration errors (wrong DHCP pools and such). In this lesson I want to show

Mar 22, 2026

Troubleshoot DHCP on Catalyst 9000 Switches

This document describes how to troubleshoot DHCP on Catalyst 9000 switches.

Mar 14, 2026

Troubleshoot problems on the DHCP client

We recommend that you collect data simultaneously on both the DHCP client and server side when the problem occurs. However, depending on the actual problem, you can also start your

Jul 27, 2025

User not getting IP via DHCP from Core Switch

DHCP is configured in core switch. But from yesterday many users (LAN and Wifi) are facing issue as they are getting disconnected from network due to not getting any ip via DHCP from

Feb 18, 2026

Guidance for troubleshooting DHCP

These steps ensure thorough troubleshooting using Wireshark to pinpoint where DHCP communication breaks down, facilitating quicker resolution of DHCP configuration or network issues.

Mar 30, 2026

DHCP on guest wireless not working after core switch replacement

Issue was resolved, was as simple as the wrong cable plugged into the wrong port. You''ve got an overwhelming amount of config info pasted there. If I understand the issue correctly, your

May 29, 2026

Can''t Reach DHCP Server: 5 Ways to Fix it

Can''t Reach DHCP Server: 5 Ways to Fix It Dynamic Host Configuration Protocol (DHCP) is a fundamental network protocol that automatically configures devices on a network,

Jun 14, 2026

Troubleshoot DHCP Issues on Catalyst 9000 DHCP

This document describes how to troubleshoot slow or intermittent DHCP address allocation failures on Catalyst 9000 switches as DHCP relay agents.

Apr 02, 2026

DHCP problem after reload/power down

Once power is restored (or after reload), all devices configured with a static IP have full connectivity, however, any device configured via DHCP lose connectivity and have problems

Oct 16, 2025

How to troubleshoot DHCP communication problems on

Imagine you have a repurposed enterprise switch with a Dynamic Host Configuration Protocol (DHCP) service that you need to troubleshoot. There

Jul 17, 2025

Windows Server DHCP Failures Post-June 2025 Updates: Causes,

After removal and a system reboot, almost all administrators reported an immediate restoration of the DHCP Server service. Caution: This workaround rolls back not just the networking

Sep 13, 2025

Microsoft: June Windows Server security updates cause DHCP i

Reports of DHCP failures after Microsoft''s June Windows Server security updates tend to follow the same pattern: leases start failing, failover relationships destabilize, or the DHCP service

Mar 14, 2026

Troubleshoot DHCP Client Connectivity Issue on a

This document describes various DHCP-related issues encountered by wireless clients when connected to a Cisco 9800 Wireless LAN Controller.

Jan 05, 2026

Windows Server DHCP Failures After June 2025 Patches: Causes

A DHCP outage blamed on one Windows Server update may actually involve a relay agent that stopped forwarding requests, an NPS policy that no longer matches, a DC that is

Aug 12, 2025

Why Your DHCP Lease Isn''t Being Released?

Resolving DHCP Lease Failures: If your DHCP lease fails, you might find it beneficial to follow the same steps above—check for updates, manually

Jul 22, 2025

Unable to obtain DHCP Ip after restart or if computer goes to sleep

I found the solution guys, so what i did was i disabled the dhcp feature on my router and that did the trick and the dhcp is now assigning me the ip address as soon as i start the computer.

Dec 03, 2025

DHCP Troubleshooting: PCs Failing to Obtain IP Address & Core

In this troubleshooting video, I worked through a scenario where PCs 1 and 2 could not obtain an IP address from a core switch DHCP server.

Sep 02, 2025

DHCP Error: Causes, Troubleshooting Steps, and How

Learn what a DHCP error is, its common causes, and step-by-step troubleshooting tips to quickly resolve connection issues.