diff --git a/mk/mono.mk b/mk/mono.mk
index 8dd90fe3c5..68446a2b6c 100644
--- a/mk/mono.mk
+++ b/mk/mono.mk
@@ -1,4 +1,4 @@
-NEEDED_MONO_VERSION := 761220d914e28b3ebd67e5642cf8c200110f62ec
+NEEDED_MONO_VERSION := 17ac7dcfc74e7371b99a1b7bf73d17e78df90c55
 NEEDED_MONO_BRANCH := 2019-06
 
 MONO_DIRECTORY := mono
diff --git a/tests/bcl-test/macOSModern-xammac_net_4_5_System_xunit-test.dll.ignore b/tests/bcl-test/macOSModern-xammac_net_4_5_System_xunit-test.dll.ignore
new file mode 100644
index 0000000000..9f6934406d
--- /dev/null
+++ b/tests/bcl-test/macOSModern-xammac_net_4_5_System_xunit-test.dll.ignore
@@ -0,0 +1,118 @@
+# System.Net.Test.Common.VirtualNetwork+VirtualNetworkConnectionBroken : Connection broken 
+# Created a mono issue for them: https://github.com/mono/mono/issues/15929
+System.Net.Security.Tests.SslStreamStreamToStreamTest_BeginEnd.SslStream_StreamToStream_WriteAsync_ReadByte_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_BeginEnd.SslStream_StreamToStream_Authentication_IncorrectServerName_Fail
+System.Net.Security.Tests.SslStreamStreamToStreamTest_BeginEnd.SslStream_StreamToStream_Dispose_Throws
+System.Net.Security.Tests.SslStreamStreamToStreamTest_BeginEnd.SslStream_StreamToStream_WriteAsync_ReadAsync_Pending_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_BeginEnd.SslStream_StreamToStream_Successive_ClientWrite_Async_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_BeginEnd.SslStream_StreamToStream_Write_ReadByte_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_BeginEnd.SslStream_StreamToStream_EOFDuringFrameRead_ThrowsIOException
+System.Net.Security.Tests.SslStreamStreamToStreamTest_BeginEnd.SslStream_StreamToStream_Successive_ClientWrite_Sync_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_BeginEnd.SslStream_StreamToStream_Authentication_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_BeginEnd.SslStream_StreamToStream_Successive_ClientWrite_WithZeroBytes_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_BeginEnd.SslStream_StreamToStream_LargeWrites_Sync_Success(randomizedData: True)
+System.Net.Security.Tests.SslStreamStreamToStreamTest_BeginEnd.SslStream_StreamToStream_LargeWrites_Sync_Success(randomizedData: False)
+System.Net.Security.Tests.ServerAllowNoEncryptionTest.ServerAllowNoEncryption_ClientRequireEncryption_ConnectWithEncryption
+System.Net.Security.Tests.AsyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: Tls11, serverProtocols: null)
+System.Net.Security.Tests.AsyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: None, serverProtocols: None)
+System.Net.Security.Tests.AsyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: None, serverProtocols: null)
+System.Net.Security.Tests.AsyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: Tls | Tls11 | Tls12, serverProtocols: null)
+System.Net.Security.Tests.AsyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: Tls12)
+System.Net.Security.Tests.AsyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: Tls | Tls11 | Tls12)
+System.Net.Security.Tests.AsyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: Default)
+System.Net.Security.Tests.AsyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: None)
+System.Net.Security.Tests.AsyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: Tls11)
+System.Net.Security.Tests.AsyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: Tls12, serverProtocols: null)
+System.Net.Security.Tests.AsyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: null)
+System.Net.Security.Tests.AsyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: Default, serverProtocols: null)
+System.Net.Security.Tests.ServerAsyncAuthenticateTest.ServerAsyncAuthenticate_EachSupportedProtocol_Success(protocol: Tls12)
+System.Net.Security.Tests.ServerAsyncAuthenticateTest.ServerAsyncAuthenticate_EachSupportedProtocol_Success(protocol: Ssl3)
+System.Net.Security.Tests.ServerAsyncAuthenticateTest.ServerAsyncAuthenticate_EachSupportedProtocol_Success(protocol: Default)
+System.Net.Security.Tests.ServerAsyncAuthenticateTest.ServerAsyncAuthenticate_EachSupportedProtocol_Success(protocol: Tls11)
+System.Net.Security.Tests.ServerAsyncAuthenticateTest.ServerAsyncAuthenticate_EachSupportedProtocol_Success(protocol: Tls)
+System.Net.Security.Tests.ServerAsyncAuthenticateTest.ServerAsyncAuthenticate_AllClientVsIndividualServerSupportedProtocols_Success(serverProtocol: Default)
+System.Net.Security.Tests.ServerAsyncAuthenticateTest.ServerAsyncAuthenticate_AllClientVsIndividualServerSupportedProtocols_Success(serverProtocol: Tls11)
+System.Net.Security.Tests.ServerAsyncAuthenticateTest.ServerAsyncAuthenticate_AllClientVsIndividualServerSupportedProtocols_Success(serverProtocol: Ssl3)
+System.Net.Security.Tests.ServerAsyncAuthenticateTest.ServerAsyncAuthenticate_AllClientVsIndividualServerSupportedProtocols_Success(serverProtocol: Tls)
+System.Net.Security.Tests.ServerAsyncAuthenticateTest.ServerAsyncAuthenticate_AllClientVsIndividualServerSupportedProtocols_Success(serverProtocol: Tls12)
+System.Net.Security.Tests.SyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: Tls12)
+System.Net.Security.Tests.SyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: None, serverProtocols: None)
+System.Net.Security.Tests.SyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: Tls | Tls11 | Tls12)
+System.Net.Security.Tests.SyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: Default)
+System.Net.Security.Tests.SyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: Tls11, serverProtocols: null)
+System.Net.Security.Tests.SyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: Tls11)
+System.Net.Security.Tests.SyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: None, serverProtocols: null)
+System.Net.Security.Tests.SyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: None)
+System.Net.Security.Tests.SyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: Tls12, serverProtocols: null)
+System.Net.Security.Tests.SyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: Default, serverProtocols: null)
+System.Net.Security.Tests.SyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: null)
+System.Net.Security.Tests.SyncSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: Tls | Tls11 | Tls12, serverProtocols: null)
+System.Net.Security.Tests.SslStreamAlertsTest.SslStream_StreamToStream_DataAfterShutdown_Fail
+System.Net.Security.Tests.SslStreamCredentialCacheTest.SslStream_SameCertUsedForClientAndServer_Ok
+System.Net.Security.Tests.SslClientAuthenticationOptionsTest.ClientOptions_ServerOptions_NotMutatedDuringAuthentication
+System.Net.Security.Tests.CertificateValidationClientServer.CertificateValidationClientServer_EndToEnd_Ok(useClientSelectionCallback: True)
+System.Net.Security.Tests.CertificateValidationClientServer.CertificateValidationClientServer_EndToEnd_Ok(useClientSelectionCallback: False)
+System.Net.Security.Tests.SslStreamNetworkStreamTest.SslStream_SendReceiveOverNetworkStream_Ok
+System.Net.Security.Tests.ServerRequireEncryptionTest.ServerRequireEncryption_ClientAllowNoEncryption_ConnectWithEncryption
+System.Net.Security.Tests.ServerRequireEncryptionTest.ServerRequireEncryption_ClientRequireEncryption_ConnectWithEncryption
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Sync.SslStream_StreamToStream_Dispose_Throws
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Sync.SslStream_StreamToStream_EOFDuringFrameRead_ThrowsIOException
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Sync.SslStream_StreamToStream_Authentication_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Sync.SslStream_StreamToStream_Authentication_IncorrectServerName_Fail
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Sync.SslStream_StreamToStream_Successive_ClientWrite_WithZeroBytes_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Sync.SslStream_StreamToStream_LargeWrites_Sync_Success(randomizedData: True)
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Sync.SslStream_StreamToStream_LargeWrites_Sync_Success(randomizedData: False)
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Sync.SslStream_StreamToStream_Successive_ClientWrite_Async_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Sync.SslStream_StreamToStream_Write_ReadByte_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Sync.SslStream_StreamToStream_WriteAsync_ReadAsync_Pending_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Sync.SslStream_StreamToStream_Successive_ClientWrite_Sync_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Sync.SslStream_StreamToStream_WriteAsync_ReadByte_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Async.SslStream_StreamToStream_Authentication_IncorrectServerName_Fail
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Async.SslStream_StreamToStream_WriteAsync_ReadAsync_Pending_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Async.SslStream_StreamToStream_Successive_ClientWrite_WithZeroBytes_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Async.SslStream_StreamToStream_Authentication_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Async.SslStream_StreamToStream_EOFDuringFrameRead_ThrowsIOException
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Async.SslStream_StreamToStream_Successive_ClientWrite_Sync_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Async.SslStream_StreamToStream_LargeWrites_Sync_Success(randomizedData: False)
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Async.SslStream_StreamToStream_LargeWrites_Sync_Success(randomizedData: True)
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Async.SslStream_StreamToStream_Write_ReadByte_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Async.SslStream_StreamToStream_Successive_ClientWrite_Async_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Async.SslStream_StreamToStream_WriteAsync_ReadByte_Success
+System.Net.Security.Tests.SslStreamStreamToStreamTest_Async.SslStream_StreamToStream_Dispose_Throws
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_EachSupportedProtocol_Success(protocol: Default)
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_EachSupportedProtocol_Success(protocol: Ssl3)
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_EachSupportedProtocol_Success(protocol: Tls11)
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_EachSupportedProtocol_Success(protocol: Tls)
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_EachSupportedProtocol_Success(protocol: Tls12)
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_AllServerAllClient_Success
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_AllServerVsIndividualClientSupportedProtocols_Success(clientProtocol: Tls11)
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_AllServerVsIndividualClientSupportedProtocols_Success(clientProtocol: Ssl3)
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_AllServerVsIndividualClientSupportedProtocols_Success(clientProtocol: Tls12)
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_AllServerVsIndividualClientSupportedProtocols_Success(clientProtocol: Tls)
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_AllServerVsIndividualClientSupportedProtocols_Success(clientProtocol: Default)
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_ServerRequireEncryption_ConnectWithEncryption
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_MismatchProtocols_Fails(serverProtocol: Tls12, clientProtocol: Tls, expectedException: typeof(System.Security.Authentication.AuthenticationException))
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_MismatchProtocols_Fails(serverProtocol: Tls11, clientProtocol: Tls, expectedException: typeof(System.Security.Authentication.AuthenticationException))
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_MismatchProtocols_Fails(serverProtocol: Tls12, clientProtocol: Tls11, expectedException: typeof(System.Security.Authentication.AuthenticationException))
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_SslStreamClientServerNone_UseStrongCryptoSet
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_IndividualServerVsAllClientSupportedProtocols_Success(serverProtocol: Tls12)
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_IndividualServerVsAllClientSupportedProtocols_Success(serverProtocol: Tls)
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_IndividualServerVsAllClientSupportedProtocols_Success(serverProtocol: Tls11)
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_IndividualServerVsAllClientSupportedProtocols_Success(serverProtocol: Ssl3)
+System.Net.Security.Tests.ClientAsyncAuthenticateTest.ClientAsyncAuthenticate_IndividualServerVsAllClientSupportedProtocols_Success(serverProtocol: Default)
+System.Net.Security.Tests.ApmSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: Tls | Tls11 | Tls12, serverProtocols: null)
+System.Net.Security.Tests.ApmSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: Tls11, serverProtocols: null)
+System.Net.Security.Tests.ApmSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: Tls | Tls11 | Tls12)
+System.Net.Security.Tests.ApmSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: Tls11)
+System.Net.Security.Tests.ApmSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: None)
+System.Net.Security.Tests.ApmSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: None, serverProtocols: None)
+System.Net.Security.Tests.ApmSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: None, serverProtocols: null)
+System.Net.Security.Tests.ApmSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: Default, serverProtocols: null)
+System.Net.Security.Tests.ApmSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: Tls12)
+System.Net.Security.Tests.ApmSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: Default)
+System.Net.Security.Tests.ApmSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: Tls12, serverProtocols: null)
+System.Net.Security.Tests.ApmSslStreamSystemDefaultTest.ClientAndServer_OneOrBothUseDefault_Ok(clientProtocols: null, serverProtocols: null)
+System.Net.Security.Tests.ClientDefaultEncryptionTest.ClientDefaultEncryption_ServerRequireEncryption_ConnectWithEncryption
+System.Net.Security.Tests.ClientDefaultEncryptionTest.ClientDefaultEncryption_ServerAllowNoEncryption_ConnectWithEncryption
+System.Net.Security.Tests.ServerAllowNoEncryptionTest.ServerAllowNoEncryption_ClientAllowNoEncryption_ConnectWithEncryption
+KLASS:System.Net.Security.Tests.SslStreamSniTest
\ No newline at end of file