I hosted a Python/Flask web service on my Amazon (AWS) EC2 instance. modified the security group rules such that All inbound traffic is allowed.
I can login from ssh and ping(with public ip) is working fine but I couldn't open the service URL from the web browser. Could any one please suggest how can I debug this issue?
Thanks,
It seems that web service isn't up and running or it is not listening on right port or it is listening just on 127.0.0.1 address. Check it with 'sudo netstat -tnlp' command. You should see process name, what IP and port it is listening on.
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I have created an Ubuntu EC2 instance, and created a load balancer to point to that EC2 instance. The rules on the Listener for the load balancer look OK (ports 80 and 443). I can access the EC2 instance Apache2 HTTPD server in a Browser using the EC2 IP address and Domain (only port 80 is working, no HTTPS).
The inbound rules for the security group look OK, i.e. port 80 and port 443.
The health check is checking the server every 30 seconds, and is showing as healthy every time.
The main problem is that when I try to connect to the webserver in a browser using the DNS name for the load balancer, the page times out, and I do not see the request hit the Apache2 server logs. However, I can connect when using the EC2 instance domain name, and I also see the request hitting the Apache2 server logs.
I wondered if I could please ask if anyone else has had the same issue with the load balancer DNS name not resolving to the EC2 instance?
Many thanks,
Martin
EDIT: This was resolved by setting the correct security group.
I'm unable to connect to my EC2 instance where I have an apache web server running (also running an Express.js server on a different port). I have updated the security group to allow incoming requests to http and https ports but I continue to get this response in the browser:
This site can’t provide a secure connection
*********** sent an invalid response.
ERR_SSL_PROTOCOL_ERROR
I am able to ssh into my EC2 instance.
Other than ensuring that the correct ports are open and that a service is listening on those ports, is there any configuration needed to setup simple web server on EC2?
Current security group settings:
Currently open ports (sudo lsof -i -P -n | grep LISTEN):
There are some similar questions posted but they are either vague or have been left for dead
You need to install mod_ssl to tell apache to serve httpS connections.
You can use the default (or self signed certificate) to check the connectivity on port 443. If you need a valid ssl certificate, you can get one for free from Let's Encrypt: https://letsencrypt.org/
You can use CertBOT to auto renew certificates: https://letsencrypt.org/getting-started/
I have created a Windows instance in EC2, also installed the Bitnami WAMP stack there. The web app runs on the instance, however it does not display on a browser outside the instance with the public IP of the instance.
I have configured the Security Groups this way:
Port 80 (HTTP inbound and outbound)
Port 443 (HTTPS inbound and outbound).
What else need to be done, in order to display the web app on a browser? Thanks
The issue was solved by disable the Firewalls on the Windows O.S directly (instance).
What I'm trying to do is access my webserver on my EC2 from the outside.
Here's what I've done so far:
I've opened all Incoming Traffic to anywhere both for IPv4 and IPv6 in the EC2's Security group
Disabled the firewall from the Control Panel in the EC2 for both public and private
Started my webserver on port 80
From outside the ec2:
I can ping the EC2 succesfully
If I run telnet <my ec2 ip> 80 I get telnet: Unable to connect to remote host: Connection refused
If I run nmap <my ec2 ip> port 80 is not listed
From inside the ec2:
I was able to connect from localhost:80 in EC2's browser
If I ran netstat -aon it shows it is listening on port 80
Make sure that your web server is bound to the external network interface.
Using 0.0.0.0 will ensure that connections can be made from any interface. On the other hand, using 127.0.0.1 (localhost) would have behavior like what you describe, where you can connect to the web server locally, you can reach the host externally (e.g. via ping) but cannot connect to the web server externally.
Is your EC2 instance in a custom VPC? If so, look at attaching an Internet Gateway to the VPC and update the route tables associated with the subnet in which your instance is running.
For this answer I am assuming that you are using IIS as your web server.
1) Start Internet Information Services (IIS) Manager.
2) Expand the left hand panel "Connections" and locate your web server under "Sites".
3) Select your web site. In the right hand panel click on "Bindings".
4) A "Site Bindings" dialog box will open.
5) Under the tab "IP Address" make sure that an asterisk displays so that the server binds to all network interfaces on startup.
5) In the right hand panel under "Manage Website" click "Restart".
I have the web application hosted on EC2 instance and created the DNS for it. The web page works fine when I hit the URL in browser. However, when I curl the URL from EC2 instance, there is no response or rather getting connection error.
curl: (7) Failed connect to dnsurl.com:80; Operation now in progress
Also, in my web application, I am calling a servlet inside another servlet using Apache Post method. This is not working as well. The same code works fine on non-EC2 servers.
Not working:-
curl dnsurl.com
curl elburl.com
Working:-
Curl to other http urls are working fine from EC2 instance
curl http://www.w3schools.com/Tags/ref_urlencode.asp
Your URLs are resolved to the public IP addresses. So the request goes outside your EC2 instance. For that to work you need the following:
Your security group should allow outbound traffic on port 80.
Your network ACL should allow outbound traffic on port 80.
Opening the ALB (Application Load Balancer) to allow inbound traffic from the EC2 instance on port 80 has resolved the issue.