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Rather depends on your proxy server but you can usually configure a custom error page for status codes, something like this:<br />
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error_page 502 503 /path_to_your_custom_page
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Rather depends on your proxy server but you can usually configure a custom error page for status codes, something like this:

error_page 502 503 /path_to_your_custom_page

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not easy, as the custom error page wont be displayed if the proxy is down.<br />
<br />
may have to consider creating a custom page on the clients, via group policy for example, which shows hew custom error whenever it cannot connect to the proxy.<br />
<br />
otherwise you'll have to arrange a second proxy which can process the error page when the primary proxy is down.
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not easy, as the custom error page wont be displayed if the proxy is down.

may have to consider creating a custom page on the clients, via group policy for example, which shows hew custom error whenever it cannot connect to the proxy.

otherwise you'll have to arrange a second proxy which can process the error page when the primary proxy is down.

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I want to seta maintennace page for user so that when a &nbsp;proxy is down then they will get a message that &quot;prxoy is down for mainteneace purposes Pleas wait&quot;
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I want to seta maintennace page for user so that when a  proxy is down then they will get a message that "prxoy is down for mainteneace purposes Pleas wait"

maintenance page

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.

Linux

Microsoft Forefront, formerly known as Internet Security and Acceleration Server (ISA Server), is a network router, firewall, antivirus program, VPN server and web cache that runs on Windows servers. It includes identity management and protection systems, and discontinued systems for threat management and network protection, along with protection for Sharepoint and Exchange. The scope of discussions includes forward and reverse proxy, application and service publishing, virtual private networks (VPNs), outbound access rules, SSL certificates and network routing within either a single node or an highly-available array pairing.

Microsoft Forefront ISA Server

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.