I created a simple project with a MavenReference and a simple GitHub action to build it. (https://github.com/superstrom/PB)
When the action is run by ubuntu-latest, I get a "SocketException: Unrecognized Windows Sockets error: 11: connect" error.
/home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : ArtifactTransferException: Could not transfer artifact org.apache.pdfbox:pdfbox:pom:2.0.27 from/to central (https://repo1.maven.org/maven2/): Unrecognized Windows Sockets error: 11: connect [/home/runner/work/PB/PB/PB/PB.csproj]
/home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : [/home/runner/work/PB/PB/PB/PB.csproj]
/home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : SocketException: Unrecognized Windows Sockets error: 11: connect [/home/runner/work/PB/PB/PB/PB.csproj]
/home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : at org.eclipse.aether.transport.http.HttpTransporter.execute(HttpUriRequest , EntityGetter ) [/home/runner/work/PB/PB/PB/PB.csproj]
/home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : at org.eclipse.aether.transport.http.HttpTransporter.implGet(GetTask ) [/home/runner/work/PB/PB/PB/PB.csproj]
/home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : at org.eclipse.aether.spi.connector.transport.AbstractTransporter.get(GetTask task) [/home/runner/work/PB/PB/PB/PB.csproj]
/home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : at org.eclipse.aether.connector.basic.BasicRepositoryConnector.GetTaskRunner.runTask() [/home/runner/work/PB/PB/PB/PB.csproj]
/home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : at org.eclipse.aether.connector.basic.BasicRepositoryConnector.TaskRunner.run() [/home/runner/work/PB/PB/PB/PB.csproj]
/home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : [/home/runner/work/PB/PB/PB/PB.csproj]
I don't know if this is a GitHub Actions issue, or an IKVM issue.
I created a simple project with a MavenReference and a simple GitHub action to build it. (https://github.com/superstrom/PB) When the action is run by ubuntu-latest, I get a "SocketException: Unrecognized Windows Sockets error: 11: connect" error.
/home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : ArtifactTransferException: Could not transfer artifact org.apache.pdfbox:pdfbox:pom:2.0.27 from/to central (https://repo1.maven.org/maven2/): Unrecognized Windows Sockets error: 11: connect [/home/runner/work/PB/PB/PB/PB.csproj] /home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : [/home/runner/work/PB/PB/PB/PB.csproj] /home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : SocketException: Unrecognized Windows Sockets error: 11: connect [/home/runner/work/PB/PB/PB/PB.csproj] /home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : at org.eclipse.aether.transport.http.HttpTransporter.execute(HttpUriRequest , EntityGetter ) [/home/runner/work/PB/PB/PB/PB.csproj] /home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : at org.eclipse.aether.transport.http.HttpTransporter.implGet(GetTask ) [/home/runner/work/PB/PB/PB/PB.csproj] /home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : at org.eclipse.aether.spi.connector.transport.AbstractTransporter.get(GetTask task) [/home/runner/work/PB/PB/PB/PB.csproj] /home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : at org.eclipse.aether.connector.basic.BasicRepositoryConnector.GetTaskRunner.runTask() [/home/runner/work/PB/PB/PB/PB.csproj] /home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : at org.eclipse.aether.connector.basic.BasicRepositoryConnector.TaskRunner.run() [/home/runner/work/PB/PB/PB/PB.csproj] /home/runner/.nuget/packages/ikvm.maven.sdk/1.1.0/buildTransitive/netstandard2.0/IKVM.Maven.Sdk.targets(96,9): error : [/home/runner/work/PB/PB/PB/PB.csproj]
I don't know if this is a GitHub Actions issue, or an IKVM issue.