The most likely reasons why the technician is unable to access a server's package repository internally or externally are that the external firewall is blocking access and that the default gateway is incorrect.
A package repository is a source of software packages that can be installed or updated on a server using a package manager tool. A package repository can be accessed over a network using a URL or an IP address.
However, if there are any network issues or misconfigurations, the access to the package repository can be blocked or failed.
An external firewall is a device or software that controls the incoming and outgoing network traffic based on predefined rules or policies.
An external firewall can block access to a package repository if it does not allow traffic on certain ports or protocols that are used by the package manager tool.
A default gateway is a device or address that routes network traffic from one network to another network.
A default gateway can be incorrect if it does not match the actual device or address that connects the server's network to other networks, such as the internet.
An incorrect default gateway can prevent the server from reaching the package repository over other networks.

KVM-over-IP switches are the remote access version of local KVM (keyboard/video/mouse) devices. They allow administrators to control a remote system by sending keyboard and mouse signals over the network and displaying the remote system's video output on the administrator's local machine via a web browser. Administrators can perform almost any function on the remote system as long as it's powered on and connected to the network.

Port 22 is used for SSH (Secure Shell), which is a secure and encrypted protocol for remote access to a server.
Port 23 is used for Telnet, which is an insecure and unencrypted protocol for remote access. Port 990 is used for FTPS (File Transfer Protocol Secure), which is a secure and encrypted protocol for file transfer. The administrator should open port 22 and close port 23 to enable SSH and disable Telnet, as SSH is more secure and reliable than Telnet. The administrator does not need to open port 990, as FTPS is not required for making configuration changes123.
References = 1: Remote Desktop - Allow access to your PC from outside your network(https://learn.microsoft.
com/en-us/windows-server/remote/remote-desktop-services/clients/remote-desktop-allow-outside-access) 2:
Test remote network port connection in Windows 10 - Winaero(https://winaero.com/test-remote-network-port- connection-in-windows-10/) 3: Windows Command to check if a remote server port is opened?
(https://superuser.com/questions/1035018/windows-command-to-check-if-a-remote-server-port-is-opened)

This is the most likely cause of the issue because firewall rules can block or allow traffic based on source, destination, port, protocol, or other criteria. If the firewall rules are not configured properly, they can prevent remote users from accessing the cloud application server, while allowing on-site users to access it.
References: https://docs.microsoft.com/en-us/azure/virtual-network/security-overview

Port 21 and File Transfer
FTP is often thought of as a "not secure" file transfer protocol. This is mainly due to FTP sending data in clear text and offering an anonymous option with no password required. However, FTP is a trusted and still widely used protocol for transferring files Is port 23 secure?
Port 23 - Telnet. A predecessor to SSH, is no longer considered secure and is frequently abused by malware.