HP (now HPE) has made available new URLs for HPE Online Depot for VMWare Update Manager. Old URLs still work but in future they might stop working.
HP Management Software – http://vibsdepot.hpe.com/hpq/hpq-index.xml
HP Drivers – http://vibsdepot.hpe.com/hpq/hpq-index-drv.xml
HP Management Software – http://vibsdepot.hpe.com/index.xml
HP Drivers – http://vibsdepot.hpe.com/index-drv.xml
They have changed from hp.com to hpe.com.