Invalid session id

I get System.Web.Services.Protocols.SoapException : Invalid session id header when my webservice is consumed by client.

Any thoughts? This happened when a user logged in more than 6 hrs in th开发者_开发知识库e UI & didn't do any operation.

Thanks.

Based on the comment discussion I would want to add here that it appears to be related to the session timeout as mentioned. However, the question about having the client app show something specific. That is something that the client application will have to handle on its own.

if you have access to code the client app you can handle it, otherwise the developer of that app will have to make the modifications.