How to Fix Sudden GitHub SSH Connection Drops in Jenkins

Troubleshoot unexpected Jenkins and GitHub SSH connection drops with practical fixes, root cause analysis, and best practices to keep your CI/CD pipeline stable and reliable.

Table of Contents

• Introduction
• Step 1: Unmasking the Silent Block
  • Bash
  • The Culprit
• Step 2: Clearing the Digital Debris
  • Bash
• Step 3: Reclaiming Directory Ownership
  • Bash
• Conclusion

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Introduction

For the featured image on blogs.ddevops.com, a 3D isometric tech illustration featuring a glowing blue DevOps infinity loop or a holographic digital globe would perfectly set the tone for this post.

Imagine coming back after a long holiday weekend, expecting your CI/CD pipelines to be running smoothly as always. Everything was working perfectly before you left, so there is no reason to anticipate any surprises. But instead of seeing successful deployments, you are greeted by a wall of red error messages.

Your Jenkins server, which had been operating without any issues just a few days earlier, is
now displaying the following error:

ERROR: Error fetching remote repo ‘origin’

When no changes have been made to the codebase, an unexpected SSH connectivity issue between your Ubuntu server and GitHub is often the root cause. In many cases, automated security updates on the server can modify protocols, refresh security settings, or affect host recognition records. As a result, background automation processes that once worked seamlessly can suddenly stop functioning.

Here is how we identified the issue and restored the pipeline, step by step.

Step 2: Clearing the Digital Debris

Even after restoring the SSH connection, the pipeline continued to fail. The reason became clear after further investigation: multiple failed connection attempts had left the local Jenkins workspace in an inconsistent state. The existing .git directory was no longer healthy, causing Jenkins to struggle when attempting to fetch repository updates.

The quickest solution was to remove the corrupted workspace entirely and allow Jenkins to create a fresh copy from scratch

Bash

rm -rf /var/lib/jenkins/workspace/our_project
This ensured that the next build would start with a clean environment rather than relying on
damaged repository data.

Step 3: Reclaiming Directory Ownership

Once Jenkins attempted a fresh clone, another issue surfaced. This time, Git’s security mechanisms stepped in. As part of protections introduced in response to CVE-2022-24765, Git detected what it considered “dubious ownership” within the workspace directory. The result was a blocked operation and a lingering config.lock file that prevented further updates.

To resolve the problem, we reassigned ownership of the workspace to the Jenkins user and
removed the stale lock file:

Bash

sudo chown -R jenkins:jenkins /var/lib/jenkins/workspace/our_project
sudo rm -f /var/lib/jenkins/workspace/our_project/.git/config.lock

This restored the correct permissions and allowed Jenkins to manage repository files without
restrictions.

Conclusion

After re-establishing the SSH trust relationship with GitHub, removing the corrupted workspace, and correcting file ownership and permissions, the next manual build completed successfully.

The pipeline was back online, deployments resumed as expected, and the dashboard returned
to a healthy blue state.

One of the key lessons from incidents like this is that application dashboards and web Interfaces do not always reveal the complete story. When infrastructure-related issues appear unexpectedly, connecting directly to the server and troubleshooting from the perspective of the service account can significantly reduce diagnosis time.

Following the same path your automation uses often reveals issues that remain invisible at the
UI level.

Stay tuned to blogs.ddevops.com for more deep dives into Infrastructure as Code, CI/CD
automation, and Silo-Free Engineering

Reference Link:

Reference Blog for you:
How to Install and Configure Zabbix 6.0: Complete Guide
The Evolution of DevOps: Development and Operations
Introduction to CI/CD Pipelines

Written By Reeshaiel Shah