Tag Archives: vsphere client

vSphere 5.5 Client and Windows Server 2003 Error

You may have noticed that since upgrading to vSphere 5.5, the vSphere client gives you this error when trying to login from a Windows 2003 Server:

An unknown connection error occurred. (The Client could not send a complete request to the server. (The underlying connection was closed: An unexpected error occurred on a send.”

This is a known issue and is caused by a lack of SSL ciphers on Server 2003 (and Windows XP). There is a fix, however, it only works on 64 bit versions of Server 2003. You can download the hotfix from Microsoft here: