Especially with information systems, you can often ignore technical details of the infrastructure within the context and focus on domain- or business related aspects.
However, if hardware or technology plays an important role for your system, you need both a business (domain) as well as a technical context.
Example from embedded system (automotive)
In the figure below you can find a simplified example from the embedded world: the left part shows the business (domain) context, the right part depicts the technical context.
Example of web-based system
The figure below shows a small example of a (web-based) information system with business and technical context.
You recognize protocols such as HTTPS or SSH within the technical context, which are intentionally not mentioned in the domain context.
Further, the (from a domain point of view external) component “Reporting” is deployed in the same technical infrastructure as the main system.