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05/30/2017
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Posted 2.1.109.44
09/04/2014
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Randy,
I validated with 2.1.109.44 the issue we were facing is fixed now. Able to connect to the OPC Servers in the DCOM hardened environment without any issues. Any timeline for getting release version?
Regards,
Vijay
05/30/2017
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That was a lot easier than I expected.
I will post the release version once I complete a few QA checks.
Thanks for verifying.
05/30/2017
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Updated OPCClassic .NET API to work with DCOM issue
09/04/2014
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Randy,
The binaries in the nugetpackages in the build doesn’t seems to reflect the fix. We tried to reference the assemblies from the nuget packages we were getting into same problem as before. This works fine if we try to use the binaries compiled from the source code.
I tried to disassemble the assemblies in the nugetpacakge and noticed that the fix available in the code is not getting reflected. Copied below the disassmbled code for the OpcCom.Interop.ServerInfo.Allocate allocate method where the fix is avaiable.
// OpcCom.Interop.ServerInfo
public Interop.COSERVERINFO Allocate(string hostName, NetworkCredential credential)
{
string text = null;
string text2 = null;
string text3 = null;
if (credential != null)
{
text = credential.UserName;
text2 = credential.Password;
text3 = credential.Domain;
}
this.m_hUserName = GCHandle.Alloc(text, GCHandleType.Pinned);
this.m_hPassword = GCHandle.Alloc(text2, GCHandleType.Pinned);
this.m_hDomain = GCHandle.Alloc(text3, GCHandleType.Pinned);
this.m_hIdentity = default(GCHandle);
if (text != null && text != string.Empty)
{
this.m_hIdentity = GCHandle.Alloc(new Interop.COAUTHIDENTITY
{
User = this.m_hUserName.AddrOfPinnedObject(),
UserLength = (uint)((text != null) ? text.Length : 0),
Password = this.m_hPassword.AddrOfPinnedObject(),
PasswordLength = (uint)((text2 != null) ? text2.Length : 0),
Domain = this.m_hDomain.AddrOfPinnedObject(),
DomainLength = (uint)((text3 != null) ? text3.Length : 0),
Flags = 2u
}, GCHandleType.Pinned);
}
this.m_hAuthInfo = GCHandle.Alloc(new Interop.COAUTHINFO
{
dwAuthnSvc = 10u,
dwAuthzSvc = 0u,
pwszServerPrincName = IntPtr.Zero,
dwAuthnLevel = 2u,
dwImpersonationLevel = 3u,
pAuthIdentityData = (this.m_hIdentity.IsAllocated ? this.m_hIdentity.AddrOfPinnedObject() : IntPtr.Zero),
dwCapabilities = 0u
}, GCHandleType.Pinned);
return new Interop.COSERVERINFO
{
pwszName = hostName,
pAuthInfo = ((credential != null) ? this.m_hAuthInfo.AddrOfPinnedObject() : IntPtr.Zero),
dwReserved1 = 0u,
dwReserved2 = 0u
};
}
Could you please check and address if there are any issues?
Regards,
Vijay
05/30/2017
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Something got messed up on the build machine.
Please check 2.1.109.54.
09/04/2014
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Thanks Randy for the quick update.
09/22/2014
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Hi Randy,
I developed an OPC client with .NET Framework 4.7.2, then I downloaded opc-net-api-sample-clients-2.01.109.54-20220329 and I would like to compile OPC NET API.sln and use the generated files.
However, in the opc-net-api-sample-clients-2.01.109.54-20220329 code I noticed some differences between the same classes in different folders.
In particular, I noticed that in file Opc.ConnectData.cs in folder NetCore\OpcNetApi the class ConnectData contains the property:
/// <summary>
/// Use DCOM connect level security (may be needed for backward compatibility).
/// </summary>
public bool UseConnectSecurity { get; set; }
While the same class in the same file in folder NET API\Core does not contain it.
This property and other modifications in other files (OpcCom.ServerEnumerator.cs, OpcCom.Factory.cs, ServerEnumerator.cs ) are needed to make the Authentication Level parameter configurable.
In practice, while the code in folder NetCore allows you to configure the type of Authentication Level to use, the code in folder NET API does not. This possibility can be very useful for the backward compatibility of the code (as written in the comment).
Is there a further version of the API planned to realign these differences?
Regards,
Elisabetta
05/30/2017
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Please check 2.1.109.55.
09/22/2014
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Hi Randy,
Thank you for your quick answer.
I downloaded and checked the 2.01.109.55 version, and noticed that there are still the following differences between the code for NET API and the code for NetCore:
| NET API | NetCore |
|
COM Wrapper\OpcCom.ServerEnumerator.cs
namespace OpcCom class ServerEnumerator method GetAvailableServers method CLSIDFromProgID |
OpcNetApi.Com\OpcCom.ServerEnumerator.cs
namespace OpcCom class ServerEnumerator method GetAvailableServers method CLSIDFromProgID |
|
m_server = (IOPCServerList2)OpcCom.Interop.CreateInstance(CLSID, host, credentials, false)
|
m_server = (IOPCServerList2)OpcCom.Interop.CreateInstance(CLSID, host, credentials, connectData?.UseConnectSecurity ?? false);
|
| Common | NetCore |
|
NetRcw\ServerEnumerator.cs
namespace OpcRcw class ServerEnumerator method Connect |
OpcComRcw\ServerEnumerator.cs
namespace OpcRcw class ServerEnumerator method Connect |
| public void Connect(string host, string username, string password, string domain) |
public void Connect(string host, string username, string password, string domain,
bool useConnectSecurity = false)
|
| unknown = Utils.CreateInstance(OPCEnumCLSID, host, username, password, domain, false); |
unknown = Utils.CreateInstance(OPCEnumCLSID, host, username, password, domain, useConnectSecurity);
|
Regards,
Elisabetta
05/30/2017
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Put a task in to get rid of all of the duplicate code….
Try 2.01.109.56
09/22/2014
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Hi Randy,
I downloaded and checked the 2.01.109.56 version. Unfortunately in this version there is still a difference to be corrected.
| NET API | NetCore |
|
COM Wrapper\OpcCom.ServerEnumerator.cs
namespace OpcCom class ServerEnumerator method CLSIDFromProgID |
OpcNetApi.Com\OpcCom.ServerEnumerator.cs
namespace OpcCom class ServerEnumerator method CLSIDFromProgID |
|
m_server = (IOPCServerList2)OpcCom.Interop.CreateInstance(CLSID, host, credentials, false)
|
m_server = (IOPCServerList2)OpcCom.Interop.CreateInstance(CLSID, host, credentials, connectData?.UseConnectSecurity ?? false);
|
Thank you in advance for your work …… and for your patience.
Elisabetta
05/30/2017
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Apologies again. I thought I searched for all CreateInstance calls.
Try again with 2.01.109.57.
10/06/2021
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Hi,
I am testing OpcNetApi using .Net Framework with remote connection but I get the following error :
Application with PID 2024 is requesting to activate CLSID {63482C41-5891-81A2-D416-3AE306C10000} on computer XXX with explicitly set authentication level at 2. The lowest activation authentication level required by DCOM is 5(RPC_C_AUTHN_LEVEL_PKT_INTEGRITY). To raise the activation authentication level, please contact the application vendor.
I changed the Dcom setting on the client machine (dcomcnfg->My Computer -> Default Properties -> Default Authentication level)from Connect to Packet Integrity but It didn´t work.
Can you help me with some steps to continue with my testes.
Regards,
Ana
05/30/2017
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The client code is not initializing the DCOM correctly. You need to update the client code.
10/06/2021
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Hi Randy
Thanks for your answer, my code to connect
// txtServer.Text = “opcda://XX.x.XX.x/Smar.DfiOleServer.0”
Opc.URL url = new Opc.URL(txtServer.Text);
OpcCom.Factory fact = new OpcCom.Factory();
server = new Opc.Da.Server(fact, null);
server.Connect(url, new Opc.ConnectData(new System.Net.NetworkCredential()));
I can establish the connection without error but when I try to read 1 Tag (item) I get error
Application with PID 2024 is requesting to activate CLSID {63482C41-5891-81A2-D416-3AE306C10000} on computer XXX with explicitly set authentication level at 2. The lowest activation authentication level required by DCOM is 5(RPC_C_AUTHN_LEVEL_PKT_INTEGRITY). To raise the activation authentication level, please contact the application vendor.
I can´t found some method in the Opc.Da dll that initializing the DCOM with this authentication level, can you help my with this
Regards,
Ana
05/30/2017
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You need to use the latest version of the .NET API (2.01.109.57).
Can you confirm you are using it?
10/06/2021
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Hi Randy
I am using the .NET API 2.0.50727.
How can I get the version 2.01.109.57?
Regards,
Ana
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