Assume that a user (user A) installs Microsoft Office 2013 Service Pack 1 (SP1) on a Lync 2013 client. Then, user A tries to send a file to another user (user B) in a Persistent Chat room by using the client. In this situation, user A may encounter the following issues:
If user A is an external user and user B is an internal user, user A cannot send the file. Additionally, user A will receive error ID 70.
If user A is an internal user and user B is an external user, user A cannot send the file. Additionally, user A will receive the following error message:
error in transfer
This issue occurs because the Persistent Chat server is only supported to provide an Internal Web Services URL to clients that are connected to the internal network during a file transfer process.
For more information about Office 2013 Service Pack 1 (SP1), click the following article number to view the article in the Microsoft Knowledge Base:
2817430 Description of Microsoft Office 2013 Service Pack 1 (SP1)