Ngrok errors '502 bad gateway'
HttpsNgrokHttp TunnelingHttps Problem Overview
Quite new to using any sort of Web App stuff, and I've been trying to slowly build a Facebook Messenger Bot. When I try to use ngrok I can't visit the address I'm given, i.e:
ngrok http 5000
is what I'm putting in the command line, and it's returning this:
ngrok by @inconshreveable
Session Status online
Version 2.1.18
Region United States (us)
Web Interface http://127.0.0.1:4040
Forwarding http://ea986ca5.ngrok.io -> localhost:5000
Forwarding https://ea986ca5.ngrok.io -> localhost:5000
Connections ttl opn rt1 rt5 p50 p90
0 0 0.00 0.00 0.00 0.00
But when I take the address 'https://ea986ca5.ngrok.io'; as is required by the Facebook developer's page, it says:
The connection to http://ea986ca5.ngrok.io was successfully tunneled to your
ngrok client, but the client failed to establish a connection to the local
address localhost:5000.
Make sure that a web service is running on localhost:5000 and that it is a
valid address.
The error encountered was: dial tcp [::1]:5000: connectex: No connection
could be made because the target machine actively refused it.
Is it a problem with my local port? Thanks!
Https Solutions
Solution 1 - Https
This worked for me
ngrok.exe http -host-header=rewrite localhost:<Your Port number>
e.g:
ngrok.exe http -host-header=rewrite localhost:5219
Im using visual studio 2017 dont know if it effects anthing.
Solution 2 - Https
Try to explicitly set the localhost IP:
ngrok http 127.0.0.1:5000 instead of ngrok http 5000
Good luck!
Solution 3 - Https
Just as @njzk2 should have said, if you don't have a web server running so it cannot work. I would like to make it clearer to you, if you are still confused.
What ngrok does, is to make your local server (running on localhost) to be available to the outside world (rest of the internet). On its own, it is not a web server. So for your bot development you need to have a web server running on a defined port (which in your case is 5000). Then you can point ngrok to this port so that it will redirect requests sent to your public address to the program running on that port. The web server will then accept and handle requests from Facebook
Solution 4 - Https
I found I had to remove the quotes around the -host-header section to get this to work with the latest ngrok version (2.3.35):
ngrok http https://localhost:5001 -host-header=localhost:5001
(Currently not enough rep to add comments on any of the answers above)
Solution 5 - Https
Step 1 - Register to ngrok and download .exe file in dashboard page
Step 2 - Open terminal and copy & paste from the dashboard the line without ./
Step 3 - run your localhost
Step 4 - If step 2 was successfully done, paste in the same terminal (step 2) the line with your localhost port
ngrok http https://localhost:44386 -host-header="localhost:44386"
Step 5 - Copy the URL generated in the terminal and waalla.. you can ping to it.
In case of <<<
Solution 6 - Https
Try like below:
ngrok http 127.0.0.1:8080 -host-header="127.0.0.1:8080"
Solution 7 - Https
It seems that this issue has now been resolved in the latest version of ngrok: https://github.com/inconshreveable/ngrok/issues/448
Basically, what you do is to specify that you are using https like this:
ngrok http https://localhost:54321 -host-header="localhost:54321"
At least, this resolved the issue for me. Replace 54321 with your actual port number.
Solution 8 - Https
If you are trying to use ngrok to point to an https localhost url, set up a proxy.
see this github issue comment:
https://github.com/inconshreveable/ngrok/issues/448#issuecomment-414214242
Solution 9 - Https
In my case, it was the project in Visual Studio 2017 .Net Core 2.1 was created to use https with a self-signed certificate. If you don't need your localhost to be https, then what fixed it for me was creating a new web project and unchecking https. When you run ngrok (ngrok http port-number-from-IISExpress) it provides you with an https url you can use for development.
Solution 10 - Https
For me, switching the protocol from http to tls worked since I am forwarding only a secure connection. I didn't need to rewrite the header.
Just for context, I am forwarding a connection to a running docker container on Ubuntu 16.
PS: You still access the address using https in the browser, not tls.
Solution 11 - Https
MAKE SURE SERVER LISTENS ON THE SAME PORT WHERE NGROK IS TUNNELED
In my case I was running ngrok using 'ngrok HTTP 3002', while my express server was running at port 5000, hence throwing BAD GATEWAY error.
I restarted ngrok on port 5000 and it worked like a charm.
Solution 12 - Https
I lost almost a day becuase of this, It won't just start the webhost if the function is not running. You need to locally run the function before you start the ngrok
https://docs.microsoft.com/en-us/azure/azure-functions/functions-debug-event-grid-trigger-local
its working for ,me
Solution 13 - Https
I had to use both (1) the answer from @user6483104 and (2) start my ngrok tunnel using the unsecured URL defined in my project (vs the SSL URL ie. https).
See my answer here: https://stackoverflow.com/questions/46982123/how-to-configure-visual-studio-2017-to-expose-a-non-encrypted-port-in-a-asp-net/48965005#48965005
Note: If I'm wrong about there being a default unsecured URL, this answer (https://stackoverflow.com/questions/46507029/how-to-disable-https-in-visual-studio-2017-web-proj-asp-net-core-2-0/48964959#answer-46507122) claims to have a solution for disabling the secured URL. I didn't try it because there was already an unsecured URL defined in my existing project (as I suspect there is with yours as well)
Solution 14 - Https
502 gateway error occurs because ngrok not able to receive any reponse from Localhost.
The things need to be done is :
- Start a webserver in a Port
- Trigger ngrok command in that Port.
What I have done is
- Started a tomcat Web Server in 8080.
- Then Triggered ngrok http 8080.
It works really cool ...
Try this .....
Hope it works for You .
Solution 15 - Https
If you just with to use ngrok to intercept incoming data, and you do not have a local webserver for whatever reason, then you can use ncat.
nc -l 5000
This will create a process that listens on port 80.
So when used in combination with
ngrok http 5000
You will no longer get the '502 bad gateway' error.
Solution 16 - Https
I had to put my server ip address and works perfect!
./ngrok http [ip server]:5000
Solution 17 - Https
i had the same issue,
because, i forgot to run the localhost:3000 port, which was supposed to be running some node server.
after i run node server, then i run, ngrok http 3000, so that it will cloud that node server in ngrok for globally access in internet.
Solution 18 - Https
I have solved the issue by killing the processes. Only 4 processes are allowed.
First command top to see your streamlit processes. You will see:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
Just type kill PID [PID VALUE] and re-run the cell.
Solution 19 - Https
I finally made it
ngrok http 80
and then start another service on ur localhost:80... in my case, I use these
php -S localhost:80
and for reverse shell stuffs ..
nc -nlvp 80
Your problem is now fixed. ^_^
Solution 20 - Https
This error can occur if you have an HTTP rule to redirect HTTP to HTTPS.
You can disable this for your developer machine or add a custom rule based on the X-Original-Host header:
I'm using the IIS rewrite plug-in and this is how I fixed it
<rule name="Redirect to https" enabled="true" patternSyntax="ECMAScript" stopProcessing="true">
<match url=".*" negate="false" />
<conditions logicalGrouping="MatchAll">
<add input="{HTTPS}" pattern="off" />
<add input="{HTTP_X_Original_Host}" pattern="yourngrokname.ngrok.io" negate="true" />
</conditions>
<action type="Redirect" url="https://{HTTP_HOST}{REQUEST_URI}" redirectType="Found" />
</rule>