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503 Service Unavailable errors can appear in any browser in any operating system, including Windows 10 back through Windows XP, macOS, Linux, etc. If it has internet access, then you could see a 503 in certain situations. Even your smartphone or other nontraditional computers.
Ниже описана последовательность действий по устранению ошибок, призванная решить проблемы Service Unavailable.