Converter Standalone Server On Port 443 — Failed To Connect To Vmware Vcenter
The error typically occurs when the Converter client cannot establish a secure handshake with the server component. This is most often caused by a stopped service, a port conflict with another application (like IIS or Apache), or firewall restrictions. Core Troubleshooting Steps
Port 443 is the default for HTTPS traffic. If another service like or Apache (often bundled with XAMPP) is already listening on port 443, the Converter service may fail to bind to it.
This error typically appears when you launch the Converter client and attempt to connect to a local or remote Converter server, or when trying to connect directly to an ESXi host or vCenter Server using port 443 (the default HTTPS port). It brings the conversion process to a screeching halt, often during critical migration windows. The error typically occurs when the Converter client
The server on the other end is alive, but it presents an outdated or self-signed SSL certificate. The client, paranoid by design, refuses to shake its hand. “You say you are the vCenter Server,” the client whispers, “but your ID expired last Tuesday. I cannot trust you.”
Sometimes the error occurs when you try to connect Converter client directly to an ESXi host (port 443) or vCenter Server. In that case: If another service like or Apache (often bundled
VMware vCenter Converter is a tool of grand ambition. Its purpose is migration: to take a physical server (perhaps running an ancient, beloved Windows 2003 instance in a dusty closet) or a virtual machine from a competing hypervisor (like Hyper-V), and transplant it into the warm, standardized womb of a VMware environment.
Before diving into fixes, it is essential to understand what the error message is telling you. The server on the other end is alive,
If another application (like Internet Information Services, Skype for Business, or a local web development server) is already using port 443 on the target machine, the VMware Converter service cannot bind to the port, causing connection refusals.
The Windows Firewall on the server machine must allow inbound traffic on port 443 (or the custom port you configured in Solution 1).
