: Click Edit (top right), select Assign a new license key , and enter your code. ⚠️ Important Considerations
Enter your 25-character alphanumeric license key and click . Method 2: Via the vSphere Web Client (vCenter Environment)
If you need help with a specific part of your virtualization setup, let me know: Are you setting up a or a vCenter cluster ?
Understanding VMware ESXi 5.5 Licensing: A Comprehensive Guide
If you possess a valid 25-character license key, follow these steps to activate your host: license key vmware esxi 5.5
It’s also worth noting that if you convert a host to a paid license and then switch back to evaluation mode later, you will only get the remaining days from your original 60-day trial.
The thrum was gone. The mechanical heartbeat had stopped.
Version 5.5 does not receive security patches, leaving it exposed to modern ransomware and hypervisor-level exploits.
The beating heart of his little kingdom was a single Dell PowerEdge R720xd. On it, running on a flash drive hot-glued to an internal USB port, was VMware ESXi 5.5. It was old, cranky, and unsupported. But it ran the custom-built invoicing engine for a regional shipping firm that refused to upgrade. “If it ain’t broke, don’t fix it,” the owner, Old Man Hendricks, would growl. : Click Edit (top right), select Assign a
If your goal is to extract data out of an ESXi 5.5 host, you must build an explicit migration pathway. You cannot directly upgrade an ESXi 5.5 host to modern vSphere 7.0 or 8.0 environments due to sweeping changes in VMFS filesystem structures and metadata formats.
No vCenter support, limited CPU sockets, no advanced features like vMotion, High Availability (HA), or DRS.
An ESXi 5.5 host installs by default with a 60-day evaluation license key. This evaluation unlocks all features of the Enterprise Plus tier. To prevent management disruption after 60 days, you must apply a valid license key using either the legacy vSphere Client or the vSphere Web Client.
Modern server hardware, CPU architectures, and storage controllers (like modern NVMe drives) do not have native drivers inside the ESXi 5.5 image. Understanding VMware ESXi 5
: New installations default to a 60-day evaluation period with full features. After 60 days, virtual machines (VMs) will continue to run but cannot be powered on if shut down until a valid key is applied. 2. How to Retrieve Existing Keys
Fresh installations of ESXi 5.5 automatically start in Evaluation Mode. This mode grants 60 days of unrestricted access to the absolute highest tier of features (equivalent to Enterprise Plus).
Under the section on the left, click Licensed Features . Click Edit in the top right corner.