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Kamron Batman f150458578
fix: Fixes encryption support for pre-6.0.5 clients (#2365) 
### Summary

Fixes encryption detection for clients pre-6.0.5.0. To limit the amount of brute-force key checking we are only checking 4.0.11 to 6.0.4.
2026-03-12 21:59:01 -07:00
.config feat: Adds SerializableFieldChanged option (#2324) 2026-02-01 21:28:26 -08:00
.github chore: Adds AI instructions and SKILLs for ModernUO codebase (#2347) 2026-03-01 11:42:19 -08:00
dev-docs chore: Adds AI instructions and SKILLs for ModernUO codebase (#2347) 2026-03-01 11:42:19 -08:00
Distribution/Data feat: Adds Network Packet Documentation (#2302) 2026-01-01 17:52:56 -08:00
docs chore: Fixes 0x78 and min client version for packets.html (#2322) 2026-01-31 10:58:13 -08:00
Projects fix: Fixes encryption support for pre-6.0.5 clients (#2365) 2026-03-12 21:59:01 -07:00
.cursorrules chore: Adds AI instructions and SKILLs for ModernUO codebase (#2347) 2026-03-01 11:42:19 -08:00
.editorconfig chore(docs): Adds UnmanagedDataReader & BinaryFileReader documentation (#1968) 2024-10-01 17:07:51 -07:00
.gitattributes fix: Adds migration checks to CICD, updates dependencies, adds Fedora 37, alpine 3.17 support (#1309) 2022-12-22 12:12:47 -08:00
.gitignore chore: Adds AI instructions and SKILLs for ModernUO codebase (#2347) 2026-03-01 11:42:19 -08:00
AGENTS.md chore: Adds AI instructions and SKILLs for ModernUO codebase (#2347) 2026-03-01 11:42:19 -08:00
azure-pipelines.yml feat: Adds .NET 10 / C# 14 support. (#2258) 2025-11-11 11:26:34 -08:00
CLAUDE.md chore: Adds AI instructions and SKILLs for ModernUO codebase (#2347) 2026-03-01 11:42:19 -08:00
CODE_OF_CONDUCT.md Create CODE_OF_CONDUCT.md 2020-05-05 08:51:39 -07:00
CONTRIBUTING.md chore(license): Removes CLA requirement. All contributors moving forward will retain copyright. (#2038) 2024-12-31 02:52:58 -08:00
Directory.Build.props fix: Bumps deps. Updates copyrights (#2353) 2026-03-05 19:36:54 -08:00
FAQ.md docs: Updates FAQ for time zone issues. (#1368) 2023-03-10 00:18:36 -08:00
GEMINI.md chore: Adds AI instructions and SKILLs for ModernUO codebase (#2347) 2026-03-01 11:42:19 -08:00
global.json feat: Adds .NET 10 / C# 14 support. (#2258) 2025-11-11 11:26:34 -08:00
LICENSE Fixes more line ending issues (#267) 2020-09-27 13:54:56 -07:00
mkdocs.yml chore: Fixes github pages (#2303) 2026-01-01 19:35:35 -08:00
ModernUO.sln fix: Updates Visual Studio version in solution file to Visual Studio 2026 (#2285) 2025-12-01 14:46:36 -08:00
publish.cmd fix: Fixes publishing (#1808) 2024-05-31 12:59:59 -07:00
publish.sh fix: Fixes publishing (#1808) 2024-05-31 12:59:59 -07:00
README.md feat: Upgrades networking to use io_uring. (#2315) 2026-02-01 16:02:32 -08:00
rider-settings.zip Cleanup/Housekeeping (#242) 2020-09-12 15:31:21 -07:00
Rules.ruleset chore(docs): Adds UnmanagedDataReader & BinaryFileReader documentation (#1968) 2024-10-01 17:07:51 -07:00
SPONSORS.md chore: Updates readme files (#2247) 2025-07-27 11:04:32 -07:00
stylecop.json Updates formatting rules (#199) 2020-08-25 18:00:51 -07:00
THIRD-PARTY-NOTICES chore: Updates 3rd party notices (#1042) 2022-06-01 09:42:11 -07:00
version.json feat: Upgrades networking to use io_uring. (#2315) 2026-02-01 16:02:32 -08:00

README.md

ModernUO - Ultima Online Server Emulator for the modern era!

ModernUO Discord Subreddit subscribers Twitter Follow

Ultima Online Server Emulator for the modern era!

GitHub license GitHub stars GitHub issues
GitHub build Azure Pipelines build

Requirements

Supported Operating Systems

Windows 10/11/2012/2016/2019/2022/2025 MacOS 14+ Debian 12+ Ubuntu 22+ LTS
Alpine 3.22+ Fedora 42+ RedHat 9+ CentOS Stream 9+ openSUSE 15.6+ SUSE Enterprise 15 SP6 Linux Mint 21+ Arch

Required Frameworks

All Operating Systems

.NET

Windows

VC++ Redistributable v14

Development

git .NET

Supported IDEs

Jetbrains Rider 2025.3+ space VSCode space Visual Studio 2026

Getting Started

  • Install prerequisite requirements
  • Clone this repository (or download the latest):
    • git clone https://github.com/modernuo/ModernUO.git
  • Open ModernUO.sln to start developing

Building/Publishing

  • Run ./publish.cmd [release|debug (default: release)] [os] [arch (default: x64)]

Linux Prerequisites

Fedora, CentOS, RHEL, etc

dnf upgrade --refresh -y
# CentOS does not come with EPEL enabled
dnf install -y epel-release epel-next-release
dnf install -y findutils libicu libdeflate-devel zstd libargon2-devel liburing-devel

Ubuntu, Debian, etc

apt-get update -y
apt-get install -y libicu-dev libdeflate-dev zstd libargon2-dev liburing-dev

OSX Requirements

brew install icu4c libdeflate zstd argon2

Running the Server

  • Follow the publish instructions
  • Run ModernUO.exe or dotnet ModernUO.dll from the Distribution directory

Troubleshooting / FAQ

Want to sponsor?

Thank you for supporting us! You can find out how by visiting the sponsors page.

Collaborators

Kamron Batman Mark1145

Thanks

  • RunUO Team & Community
  • Voxpire, the ServUO Team & Community
  • Karasho, Jaedan and the ClassicUO Community



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