Getting "Object is read only" error when setting ClientCredentials in WCF

Question

I have a proxy object generated by Visual Studio (client side) named ServerClient. I am attempting to set ClientCredentials.UserName.UserName/Password before opening up a new connection using this code:

InstanceContext context = new InstanceContext(this);

m_client = new ServerClient(context);
m_client.ClientCredentials.UserName.UserName = "Sample";

As soon as the code hits the UserName line it fails with an "Object is read-only" error. I know this can happen if the connection is already open or faulted, but at this point I haven't called context.Open() yet.

I have configured the Bindings (which uses netTcpBinding) to use Message as it's security mode, and MessageClientCredentialType is set to UserName.

Any ideas?

Gerhard · Accepted Answer · 2012-11-02 22:56:58Z

16

I noticed that after creating an instance of the proxy class for the service, I can set the Username and Password once without errors and do a successful call to my webservice. When I then try to set the Username and Password again on the existing instance (unnecessary of course) I get the 'Object is Read-Only' error you mentioned. Setting the values once per instance lifetime worked for me.

answered Nov 2, 2012 at 22:56

Gerhard

1611 silver badge2 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

morpheus Over a year ago

more appropriately, the credentials need to be set before any service method is called. attempting to set credentials after calling a method gives error - the credentials were set implicitly when you made the service call, and cannot be changed now; they are immutable.

marknuzz Over a year ago

In my case, even something as seemingly harmless as adding an event handler to the client object (and nothing else) caused the property to become read-only.

Luizgrs Over a year ago

in my case it was setting the timeout client.InnerChannel.OperationTimeout = TimeSpan.FromMilliseconds(Timeout). It make sense, you have already created a channel, too late the change factory config mate. (this changed between 4.5.2 and 4.7.2)

Paul Mrozowski · Accepted Answer · 2008-10-14 13:43:11Z

10

It appears that you can only access these properties pretty early in the instanciation cycle. If I override the constructor in the proxy class (ServerClient), I'm able to set these properties:

base.ClientCredentials.UserName.UserName = "Sample";

I'm beginning to appreciate the people who suggest not using the automatically built proxies provided by VS.

answered Oct 14, 2008 at 13:43

Paul Mrozowski

6,7649 gold badges38 silver badges50 bronze badges

1 Comment

Shahin Dohan Over a year ago

The only reason I use Microsoft's proxy is because it automatically generates Async methods..

Gareth · Accepted Answer · 2019-01-18 11:53:34Z

9

here is the solution:

using SysSvcmod = System.ServiceModel.Description;

SysSvcmod.ClientCredentials clientCredentials = new SysSvcmod.ClientCredentials();
clientCredentials.UserName.UserName = "user_name";
clientCredentials.UserName.Password = "pass_word";

m_client.ChannelFactory.Endpoint.Behaviors.RemoveAt(1);
m_client.ChannelFactory.Endpoint.Behaviors.Add(clientCredentials);

edited Jan 18, 2019 at 11:53

Gareth

5,2636 gold badges47 silver badges73 bronze badges

answered Jun 29, 2009 at 14:19

Jack

3 Comments

Blue Clouds Over a year ago

what is m_client?

Mirzan Over a year ago

This solution really helped me to fix the issue! Thank you so much !.

Leland Hepworth Over a year ago

I was having trouble with Endpoint.Behaviors, but this question put me back on track: stackoverflow.com/q/38333824/12808884

Eugene Yokota · Accepted Answer · 2009-04-28 23:15:20Z

4

I have similar code that's passing UserName fine:

  FooServiceClient client = new FooServiceClient("BasicHttpBinding_IFooService");
  client.ClientCredentials.UserName.UserName = "user";
  client.ClientCredentials.UserName.Password = "password";

Try creating the proxy with binding name in app.config.

answered Apr 28, 2009 at 23:15

Eugene Yokota

95.9k45 gold badges219 silver badges323 bronze badges

Comments

PTD · Accepted Answer · 2019-05-16 18:51:36Z

4

The correct syntax is:

// Remove the ClientCredentials behavior.
client.ChannelFactory.Endpoint.Behaviors.Remove<ClientCredentials>();

// Add a custom client credentials instance to the behaviors collection.
client.ChannelFactory.Endpoint.Behaviors.Add(new MyClientCredentials());

http://msdn.microsoft.com/en-us/library/ms730868.aspx

It worked for me.

edited May 16, 2019 at 18:51

PTD

1,0731 gold badge16 silver badges23 bronze badges

answered Oct 24, 2013 at 11:21

Fabienne Bonzon

411 bronze badge

Comments

savitha · Accepted Answer · 2015-02-03 05:33:29Z

3

I was facing same problem, my code started working when I changed my code i.e. assigning values to Client credential immediately after initializing Client object.

here is the solution ,

ProductClient Manager = new  ProductClient();    
Manager.ClientCredentials.UserName.UserName = txtUserName.Text;
Manager.ClientCredentials.UserName.Password = txtPassword.Text;

answered Feb 3, 2015 at 5:33

savitha

391 bronze badge

1 Comment

Aaron C Over a year ago

I moved my credential setting lines next to my client creation (as you mentioned), and my code started working.

Blue Clouds · Accepted Answer · 2018-04-04 14:57:13Z

2

This will not happen if the service reference is added through -> Add service reference ->Advanced->Add Web Reference-> Url/wsdl (local disk file).

answered Apr 4, 2018 at 14:57

Blue Clouds

8,3729 gold badges84 silver badges132 bronze badges

2 Comments

Dmitriy Klyushin Over a year ago

I've just used your solution - it helped, but I'm wondering will it be a problem in furure when the .wsdl file will be updated by the owner of the service? Or I won't just see new methods untill I repeat Add service reference ->Advanced->Add Web Reference-> Url/wsdl (local disk file). and add a new xml file? Can some conflicts appear with the old generated code? Thanks!

Blue Clouds Over a year ago

U have to manually port the wsdl to the same location and update

Atul · Accepted Answer · 2018-10-11 19:57:40Z

I was facing this issue where I was trying to create a generic method to create a clients for different end points.

Here how I achieved this.

    public static T CreateClient<T>(string url) where T : class
    {
        EndpointAddress endPoint = new EndpointAddress(url);
        CustomBinding binding = CreateCustomBinding();

        T client = (T)Activator.CreateInstance(typeof(T), new object[] { binding, endPoint });
        SetClientCredentials(client);

        return client;
    }

    public static void SetClientCredentials(dynamic obj)
    {
        obj.ChannelFactory.Endpoint.Behaviors.Remove<ClientCredentials>();
        obj.ChannelFactory.Endpoint.Behaviors.Add(new CustomCredentials());

        obj.ClientCredentials.UserName.UserName = "UserId";
        obj.ClientCredentials.UserName.Password = "Password";
    }

Mike Two · Accepted Answer · 2008-10-14 10:53:11Z

0

I think your problem might be related to the use of the InstanceContext. I thought that was only needed for duplex communication channels from the server side.

I admit I'm not sure about this, but I think in this case you are telling the client to use an existing instance context so it thinks there is already a running service and will not allow changes.

What is driving the use of InstanceContext?

answered Oct 14, 2008 at 10:53

Mike Two

46.5k9 gold badges84 silver badges97 bronze badges

Comments

Kwal · Accepted Answer · 2009-12-30 21:11:27Z

0

If using a duplex client, when you instantiate it the DuplexChannelFactory within the DuplexClientBase that your client is derived from is initialized with existing credentials so it can open the callback channel, which is why the credentials would be read only.

I second Mike's question and also ask why are you using NetTcpBinding if you are not going to use its inherent transport level security? Perhaps an HTTP based binding would be a better fit? That would allow you to use certificate based security which I believe can be modified after instantiation (http://msdn.microsoft.com/en-us/library/ms576164.aspx).

answered Dec 30, 2009 at 21:11

Kwal

1,5317 silver badges11 bronze badges

Comments

Shane · Accepted Answer · 2010-04-12 14:58:55Z

0

A shot in the dark but does netTcpBinding allow username and password validation? Try using application layer (SOAP) security using a http binding

answered Apr 12, 2010 at 14:58

Shane

1,2161 gold badge11 silver badges26 bronze badges

Comments

Davit Mikuchadze · Accepted Answer · 2019-10-25 08:43:03Z

0

or you could just simply check the Credentials

    if (client.ClientCredentials.ClientCertificate.Certificate == null || string.IsNullOrEmpty(client.ClientCredentials.ClientCertificate.Certificate.Thumbprint))
    {
        client.ClientCredentials.ClientCertificate.SetCertificate(
            StoreLocation.LocalMachine,
            StoreName.My,
            X509FindType.FindByThumbprint, ConfigurationManager.AppSettings.Get("CertificateThumbprint"));
    }

answered Oct 25, 2019 at 8:43

Davit Mikuchadze

1014 bronze badges

Comments

jcs · Accepted Answer · 2022-03-29 22:36:23Z

0

In .NET 4.6 I couldn't remove the credentials using Fabienne's answer. Kept getting Compiler Error CS0308 in the Remove method. What worked for me was this:

Type endpointBehaviorType = serviceClient.ClientCredentials.GetType();
serviceClient.Endpoint.EndpointBehaviors.Remove(endpointBehaviorType);

ClientCredentials clientCredentials = new ClientCredentials();
clientCredentials.UserName.UserName = userName;
clientCredentials.UserName.Password = password;

serviceClient.Endpoint.EndpointBehaviors.Add(clientCredentials);

answered Mar 29, 2022 at 22:36

jcs

6492 gold badges12 silver badges25 bronze badges

Collectives™ on Stack Overflow

Getting "Object is read only" error when setting ClientCredentials in WCF

13 Answers 13

3 Comments

1 Comment

3 Comments

Comments

Comments

1 Comment

2 Comments

Comments

Comments

Comments

Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

13 Answers 13

3 Comments

1 Comment

3 Comments

Comments

Comments

1 Comment

2 Comments

Comments

Comments

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related