SSH remote forwarding results in 404 Not Found

Unix & Linux Asked by flow2k on December 4, 2020

On a remote server,, I am unable to access a web resource, say, So, on the remote server, I’m using ssh to create a server on and access the resource thru there, by forwarding the request back to my local machine (and have my local machine fetch the resource). This is what I’m doing on my local machine:

ssh -R

Then, on, I do

curl -v http://localhost:6050/2020/SPAA2020TutorialProgram.pdf

However, I get

* About to connect() to localhost port 6050 (#0)
*   Trying ::1...
* Connected to localhost (::1) port 6050 (#0)
> GET /2020/SPAA2020TutorialProgram.pdf HTTP/1.1
> User-Agent: curl/7.29.0
> Host: localhost:6050
> Accept: */*
< HTTP/1.1 404 Not Found
< Connection: Keep-Alive
< Content-Type: text/html
< Transfer-Encoding: chunked
< Date: Sun, 15 Nov 2020 00:41:45 GMT
< Server: LiteSpeed

What am I doing wrong?

One Answer

The problem: The server, like many web servers, does something like name-based virtual hosting. That is, it inspects the Host header of incoming requests, and can serve different content depending on what hostname the client says it's trying to reach. If you look at the verbose output from curl, it includes this header:

> Host: localhost:6050

...but I'm pretty sure that server doesn't recognize "localhost" as a domain name it should be serving, so you get problems.

Solution 1: You can tell curl to fetch the normal URL (including the "" domain), but to proxy the connection via localhost:6050:

curl -v -x localhost:6050 -O
* Trying ::1...
* Connected to localhost (::1) port 6050 (#0)
> GET HTTP/1.1
> Host:
> User-Agent: curl/7.54.0
> Accept: */*
> Proxy-Connection: Keep-Alive
< HTTP/1.1 200 OK
< Connection: Keep-Alive
< Content-Type: application/pdf
< Last-Modified: Sat, 11 Jul 2020 07:33:05 GMT
< Etag: "168eb-5f096b31-3718a48ea4a1f404;;;"
< Accept-Ranges: bytes
< Content-Length: 92395
< Date: Sun, 15 Nov 2020 01:24:27 GMT
< Server: LiteSpeed

(Note the Host: header.)

Solution 2: Explicitly override the Host header:

curl -v -H "Host:" http://localhost:6050/2020/SPAA2020TutorialProgram.pdf -O

I won't include the debug output on this one, suffice to say that it also works.

Correct answer by Gordon Davisson on December 4, 2020

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