WEBDAV CLIENT FOR WIN 10 SOFTWAREWhy does the software companies are not really taking serious these standards? However not all the clients (majority of them web browsers) are compliant with SNI. It was mentioned since June 2003 by the RFC 3546 – Transport Layer Security (TLS) Extensions. If the client doesn’t provide this “server_name” extension, the server will not know what certificate to use and most likely will reply with a default one (which could be not issued for the FQDN the client is connecting to – case in which the communication channel should not be trusted). The “extension_data” field of this extension SHALL be empty.”Īccording with the latest update ( RFC 6066 – Transport Layer Security (TLS) Extensions: Extension Definitions), the client has an important role – to include an extension of type “server_name” that will help the server to identify the appropriate certificate that will be used to secure the connections. In this event, the server SHALL include an extension of type “server_name” in the (extended) server hello. The “extension_data” field of this extension SHALL contain “ServerNameList”Ī server that receives a client hello containing the “server_name” extension MAY use the information contained in the extension to guide its selection of an appropriate certificate to return to the client, and/or other aspects of security policy. In order to provide any of the server names, clients MAY include an extension of type “server_name” in the (extended) client hello. It may be desirable for clients to provide this information to facilitate secure connections to servers that host multiple ‘virtual’ servers at a single underlying network address. “TLS does not provide a mechanism for a client to tell a server the name of the server it is contacting. RFC 6066 – Transport Layer Security (TLS) Extensions: Extension Definitions (January 2011) RFC 4366 – Transport Layer Security (TLS) Extensions (April 2006) RFC 3546 – Transport Layer Security (TLS) Extensions (June 2003) Let’s start with what IETF (Internet Engineering Task Force) RFCs are saying about Server Name Indication: When you have only one IP address available, you host multiple domains, multiple services and all of the communication traffic must be encrypted, then the only solution is to use Server Name Indication (SNI). It is the conceptual equivalent to HTTP/1.1 virtual hosting for HTTPS.” This allows a server to present multiple certificates on the same IP address and port number and hence allows multiple secure (HTTPS) websites (or any other Service over TLS) to be served off the same IP address without requiring all those sites to use the same certificate. WEBDAV CLIENT FOR WIN 10 WINDOWSIn fact is the Microsoft Windows WebDAV Client who’s not capable to handle the Server Name Indication (SNI).įrom Wikipedia: “ Server Name Indication (SNI) is an extension to the TLS protocol that indicates to what hostname the client is attempting to connect at the start of the handshaking process. After couple of minutes of digging into the settings and performing network traffic captures I realized is not the SharePoint farm fault. Recently on one of my SharePoint farms I noticed the “Open with Explorer” is not working. Contact the administrator of this server to find out if you have access permissions. A device attached to the system is not functioning.” You might not have permission to use this network resource.
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