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Mono

Mono is an open source implementation of Microsoft's .NET Framework as part of the .NET Foundation and based on the ECMA standards for C# and the Common Language Runtime.

Since .NET 6 (aka dotnet core), there is a new framework available for building cross platform applications. However, Mono is still useful on Linux for 32-bit CPUs (arm and x86) that are not supported by dotnet core.

Since Mono 6.0.12-20, we support a current version that includes support for .NET 4.8.

Certificate Store

Mono has its own certificate store for CA certificates used to validate certificates for secure connections.

The SynoCommunity package has located the certificate store in: 

/var/packages/mono/var/.mono/certs

Certificate Update

At package installation, the certificate store is updated with the currently installed ca-certificates of DSM. The command for this update is:

/var/packages/mono/target/bin/cert-sync /etc/ssl/certs/ca-certificates.crt

The package installer installs a script for later updates: 

/var/packages/mono/var/update_ca_certificates.sh

Keeping Certificates Up-to-Date

There are several options:

  • Manually SSH into your Diskstation and run the script
  • Create a Triggered Task in the DSM Task Scheduler to execute this script at system boot
  • Create a Scheduled Task in the DSM Task Scheduler to execute this script manually or with a schedule
  • Manually download and install the mono package of the already installed version. This will "update" the package with the same version, and the ca certificate update is run again.

History

There were some long lasting issues that are now fixed: