Question

I am running an Amazon Linux image on EC2. However, I cannot open port 443 when I launch my twisted server.

I created a security group and verified that the instance was using it which allowed traffic on HTTPS. (HTTPS tcp 443 443 0.0.0.0/0).

Here is the output:

ERROR:root:Exception launching the json rpc server
Traceback (most recent call last):
  File "start_ipns_proxy.py", line 27, in launch_json_rpc
    RPC_SSL_CERTIFICATE_FILE))
  File "/home/ec2-user/ipns_proxy/push_notify/twisted/internet/posixbase.py", line 444, in listenSSL
    p.startListening()
  File "/home/ec2-user/ipns_proxy/push_notify/twisted/internet/tcp.py", line 857, in startListening
    raise CannotListenError, (self.interface, self.port, le)
CannotListenError: Couldn't listen on any:443: [Errno 13] Permission denied.

It was working just fine on my local box, and when I change the port to 80 I still have the issue (HTTP was also in my security group). I also rebooted the instance and no luck.

EDIT:

Here is my netstat output
[ec2-user@domU-12-31-38-04-1E-EC push_notify]$ sudo netstat -nupt -l
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name   
tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN      1559/sshd           
tcp        0      0 127.0.0.1:25                0.0.0.0:*                   LISTEN      1592/sendmail: acce 
udp        0      0 0.0.0.0:68                  0.0.0.0:*                               1428/dhclient       
udp        0      0 10.220.29.22:123            0.0.0.0:*                               1572/ntpd           
udp        0      0 127.0.0.1:123               0.0.0.0:*                               1572/ntpd           
udp        0      0 0.0.0.0:123                 0.0.0.0:*                               1572/ntpd

Answer 1

You might be running the program that uses port lower than 1024.
Try running the program using root or sudo.