TAC advised me to install an ES and sent me the download. I staged it on my SFTP server, along with some phone loads to update in advance.
What I note is that, while the phone loads show up as valid upgrades on all my servers (all running TFTP), the ES only shows up on my 2 publishers. Is this correct? Does the ES only get applied to the publisher?
There doesn't appear to be much in the way of installation instructions for the ES, so I wanted to make sure before I install.
ES needs to be installed in all nodes in the CUCM cluster.
ES is suppose to be show up in all server for the upgrade. PUB needs to upgrade first followed by SUB's.
Try investigate the following :
1. SFTP Sever (Try restart SFTP Service)
2. investigate the connectivity from CUCM Server side.
3. check ES file extension.