Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
bd44ef4026
Contributing a ban to CrowdSec failed against a real LAPI. Three independent
defects, each sufficient on its own:
scenario_hash / scenario_version were never serialized. LAPI dereferences both
unconditionally when persisting an alert, so omitting them is a nil deref and a
500 rather than a validation error. Both are now emitted with the values a
watcher without a hub scenario is expected to send ("" and "1.0").
start_at/stop_at were formatted without an IFormatProvider. ':' is the time
separator *specifier* in a custom .NET format string, not a literal, so a shard
running under a culture like fi-FI emitted "T15.04.05.123Z" -- which Go's
time.RFC3339 rejects, producing another 500. Non-Gregorian cultures (th-TH,
ar-SA) would also shift the year. Formatting is now pinned to InvariantCulture
in FormatTimestamp, which additionally converts non-UTC input, since the
trailing 'Z' is a literal and was previously an unchecked claim.
The User-Agent was a plain product string. LAPI's default watcher profile
matches the "crowdsec/" prefix and answers 401 without it, so the header is a
protocol constraint; it is now an internal const carrying that reason.
Also fixes the same culture bug in the login-expiry parse: a bare
DateTime.TryParse on LAPI's RFC3339 expire silently fails under a mismatched
culture and falls back to a fabricated UtcNow+1h, pushing re-auth past the real
expiry and costing a 401-relogin round trip on every send.
capacity now defaults to 1 instead of 0, matching the one-decision-per-alert
shape actually being sent.
The resulting payload is field-for-field identical to a hand-verified request
that LAPI accepts. Regression tests assert the required scenario fields on the
serialized JSON rather than the DTO, since the DTO is not what goes on the
wire, and cover the timestamp across fi-FI/th-TH/ar-SA.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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ModernUO 
Ultima Online Server Emulator for the modern era!
Requirements
Supported Operating Systems
Required Frameworks
All Operating Systems
Windows
Development
Supported IDEs
Getting Started
- Install prerequisite requirements
- Clone this repository (or download the latest):
git clone https://github.com/modernuo/ModernUO.git
- Open
ModernUO.slnto start developing
Building/Publishing
Interactive Mode (Recommended for new users)
Run ./publish.cmd (Windows) or ./publish.sh (Linux/macOS) with no arguments to launch the guided build tool. It will:
- Check prerequisites (.NET SDK, native libraries)
- Walk you through configuration and platform selection
- Build and publish the server to the
Distributiondirectory - Show deployment instructions for cross-compiled builds
Command Line
./publish.cmd [release|debug] [os] [arch]
os- Supported operating systemsarchx64- Intel/AMD 64-bitarm64- ARM 64-bit
Linux Prerequisites
Fedora, CentOS, RHEL, AlmaLinux, Rocky, etc
dnf upgrade --refresh -y
# RHEL-family distributions (CentOS Stream, AlmaLinux, Rocky, RHEL) need CRB and EPEL enabled.
# Fedora skips this block.
dnf install -y dnf-plugins-core
dnf config-manager --set-enabled crb
dnf install -y epel-release
# Prerequisites
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
- The
Distributiondirectory is portable — copy it to your production server for deployment - Run
ModernUO.exeordotnet ModernUO.dllfrom theDistributiondirectory - On first run, the server will prompt you to configure game data file locations
Troubleshooting / FAQ
- See FAQ
Want to sponsor?
Thank you for supporting us! You can find out how by visiting the sponsors page.
Collaborators
Thanks
- RunUO Team & Community
- Voxpire, the ServUO Team & Community
- Karasho, Jaedan and the ClassicUO Community
Development Tools & Plugins provided with ♥ by
Code Signing Policy
Free code signing provided by SignPath.io, certificate by SignPath Foundation.
This program will not transfer any information to other networked systems unless specifically requested by the user or the person installing or operating it
Teams & Roles
Approvers & Committers: Development Team