While installing a cluster using Assisted Installer in disconnected environment, the kubeconfig file cannot be downloaded from UI. The attempt fails with `Request failed with status code 500`. Due to this, the installation cannot be initiated. 

4.19.z

 This can be reproduced by booting the nodes from `agent-ove` ISO of 36Gbs. Once the rendezvous host is configured, access the assisted ui and provide cluster configurations and try downloading the kubeconfig file in `Download Credentials` page. 

 1. Boot the nodes with `agent-ove` ISO.
 2. Configure the nodes and the rendezvous host
 3. Access the generated assisted UI page and start configuring the cluster.
 4. From the `Download Credentials` page, try downloading the kubeconfig file.    
    

The kubeconfig file cannot be download, hence, the installation cannot be initiated. 

The kubeconfig file should get downloaded and installation should start.    

The following drive link can be referred for the error screenshot - 

[+] https://drive.google.com/drive/folders/1BDsYg2FZZuzpcvosMUgOTJw5vXSyENy5?usp=sharing