Can't add ESXi host to vCenter Server

Hello,

I created a home setup of a VMware datacenter for studying purposes. I currently have 2 virtual machines: one with an ESXi host and one with vCenter Server Appliance deployed on it.

I configured the vCenter Server appliance using the web interface and I have connected to it using vSphere Client.

I have created a datacenter but when I attempt to add a host, I get "ERROR: Request timed out"
Connecting with vSphere client directly to the ESXi host works.

I can connect using SSH to the ESXi host.

I have disabled the firewall on the ESXi host.

I have read a lot of articles on the kbase however nothing helped me fix this issue.

Do you have any ideas?