Unable to tunnel through proxy. Proxy returns "HTTP/1.1 503 Service Unavailable

I'm trying to make an HTTP Request to other System.

They provided the endpoint URL which contains a Port number.

When I'm trying to make the request I facing with this ERROR:

> System.CalloutException: Unable to tunnel through proxy. Proxy returns

> "HTTP/1.1 503 Service Unavailable"

although I have added the URL in remote sites.

When I make the request from Postman - I get the response as expected.

My code is :

Http httpProtocol = new Http();

HttpRequest request = new HttpRequest();

String username2 = 'Name';

String password2 = 'Passowrd';

Blob headerValue = Blob.valueOf(username2 + ':' + password2);

String authorizationHeader = 'BASIC ' + EncodingUtil.base64Encode(headerValue);

request.setEndpoint(url);

request.setMethod('POST');

request.setHeader('Authorization', authorizationHeader);

request.setTimeout(60000);

request.setHeader('Content-Type','application/json');

request.setHeader('proxyPort','50001');

request.setHeader('proxyHost','PROXYHOST URL');

request.setHeader('proxySet','true');

HttpResponse response = httpProtocol.send(request);

Note: The userName and Password will be filled from Custom setting.

I tried with and without the proxy header, I tried to turn the BASIC auth to Basic and many other little changes that didn't work.

I'm still getting this Error.

How can I know if it not blocked by Firewall?

Any help or Idea to solve this issue

Thanks!

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