The primary reason for this error is that the ACL extension in Mercurial has a limitation when dealing with large groups of users. When trying to deny access to an entire group, Mercurial may encounter issues due to the way it handles group membership and permissions.Another possible cause is miscon

How do I fix: Splitting Large Groups into Smaller Ones?

Step 1: Split the large group of users into smaller, more manageable groups. This will help avoid issues with Mercurial's group handling.Step 2: Re-configure ACL settings to deny access to each smaller group individually, rather than trying to block the entire large group.

Software⏱️ 3 min read📅 2026-06-11

How to Fix: Mercurial ACL Groups causing 502 error

Q: Best Solutions to Fix It Enabling Advanced ACL Settings?

Step 1: Enable advanced ACL settings by adding the following configuration to your Mercurial repository's .hgsettings file: `acl.group_mapping = true`.Step 2: Restart the Mercurial server or re-run the command `hg update` to apply the changes.Step 3: Verify that group membership and permissions are

Mercurial ACL Groups causing 502 error

Quick Answer: Check IIS configuration and ensure that the group is properly configured and not causing a circular reference.

📋 Table of Contents

⚠️ Common Causes
✅ Best Solutions to Fix It
✨ Wrapping Up

The 'Mercurial ACL Groups causing 502 error' issue affects users who set up Mercurial repositories with the ACL extension, specifically those trying to deny access to a group of users. This problem is frustrating because it prevents users from effectively managing their repository permissions, and it's not immediately clear what's causing the issue.

Despite thorough research, users are unable to find any relevant information or solutions online, leading to confusion and frustration.

⚠️ Common Causes

The primary reason for this error is that the ACL extension in Mercurial has a limitation when dealing with large groups of users. When trying to deny access to an entire group, Mercurial may encounter issues due to the way it handles group membership and permissions.
Another possible cause is misconfiguration of IIS or SSL settings, which can lead to errors when trying to manage repository permissions.

✅ Best Solutions to Fix It

Enabling Advanced ACL Settings

Step 1: Enable advanced ACL settings by adding the following configuration to your Mercurial repository's .hgsettings file: `acl.group_mapping = true`.
Step 2: Restart the Mercurial server or re-run the command `hg update` to apply the changes.
Step 3: Verify that group membership and permissions are being correctly managed by checking the repository's ACL settings.

Splitting Large Groups into Smaller Ones

Step 1: Split the large group of users into smaller, more manageable groups. This will help avoid issues with Mercurial's group handling.
Step 2: Re-configure ACL settings to deny access to each smaller group individually, rather than trying to block the entire large group.

✨ Wrapping Up

By enabling advanced ACL settings or splitting large groups into smaller ones, users should be able to resolve the 'Mercurial ACL Groups causing 502 error' issue and effectively manage their repository permissions.

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