Investigate the vCenter web client virgo.log (for its location, see VMware tech doc: ). The following messages might be seen: [INFO ] cm-catalog-manager-pool-16 com.vmware.vise.vim.cm.CmCatalogManager Getting download for service provider com.vmware.ciscom.ibm.tsm.tdpvmware.IBMDataProtection download attempt: 1. [ERROR] vc-extensionmanager-pool-94 com.vmware.vise.vim.extension.VcExtensionManager Package com.ibm.tsm.tdpvmware.IBMDataProtection was not installed! Error downloading at java.net.AbstractPlainSocketImpl.connect(Unknown Source) at java.net.SocksSocketImpl.connect(Unknown Source) at java.net.Socket.connect(Unknown Source) at sun.security.ssl.SSLSocketImpl.connect(Unknown Source) Resolving the problem. Address any (unreachable host, DNS, firewall.) connectivity issue and ensure that from the vCenter server host, using a browser, the following URL: https://.