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Closed 2 years ago.
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I want to change the Kubernetes server endpoint port.
I am currently using port 6443 and would like to change it to port 7443.
Kubernetes is installed on-premises and is a single master node.
You can change the default secure port by passing the --secure-port flag when you start your k8s api server.
Checkout the next links for more:
https://kubernetes.io/docs/reference/access-authn-authz/controlling-access/#api-server-ports-and-ips
https://kubernetes.io/docs/reference/command-line-tools-reference/kube-apiserver/
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I opened a PostgreSQL port by adding a line in /etc/postgresql/10/main/pg_hba.conf
host mydatabase myuser my_ip_adress/32 md5
and then opening the port like this:
sudo ufw allow 5432/tcp
Is this secure enough? Our should I also limit the IP adresses for port 5432 in ufw / iptables?
"Secure enough" depends a lot on your requirements.
I would say that that is good enough for normal purposes. An easy improvement would be to use scram-sha-256 instead of md5 (don't forget to change the password_encryption parameter and set a new password).
If your database contains the secret algorithm that the NSA uses to break TLS encryption, you might want to use a different authentication method like Kerberos that uses central identity management rather than database passwords.
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Closed 5 years ago.
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I have a small sample application which send some data to the server and close the connection afterwards. I ran it on my localhost as server & client and it worked.
When I ran the same code after changing the IP to another host(running Cent OS in VM) as server and my client (Ubuntu), I get the following error from client binary.
client.c : 47 Error connection to remote machine
139915881411416:error:02002071:system library:connect:No route to host:bss_conn.c:246:host=192.168.56.101:6001
139915881411416:error:20073067:BIO routines:CONN_STATE:connect error:bss_conn.c:249:
I am able to ping the remote server from my terminal. Any suggestions or solutions are welcome :) .
Actually the problem was because of firewall running on server(Cent OS). After stopping the firewall using command,
service iptables stop
the client was able to make a connection with the server.
Better Solution (without stopping firewall):
Add your client's IP address in the iptables so that it will allow the client to connect to your server without stopping firewall.
iptables -I INPUT -s <client_ip_address> -j ACCEPT
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Closed 7 years ago.
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I have a HTTP enabled device on my local network that listens at let's say 192.168.1.32:9427. What's the simplest way to make public access to that socket?
you need to port forward from public ip address to private ip-address on port no. 9427
example:
public ip : 20.20.20.20
private ip : 192.168.1.32
Now when someone try to access your local http server should access via 20.20.20.20:9427
to do that :
you need to enable that on your adsl modem or on your router device
to do that for your adsl modem from here
How to Port Forward Your Router
check open ports to see if port no. 9427 is opened or not
Open Port Check Tool
you need to allow your iptables if you are using linux machine and allow port no. 9427
to do that :
iptables -I INPUT 1 -p --dport 9427 -s -j ACCEPT
echo 1 > /proc/sys/net/ipv4/ip_forward
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Closed 8 years ago.
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I installed the Apache web server on my Windows 7 machine and I'm unable to start it because Skype.exe is already using HTTP port 80 and HTTPS port 443.
I need Apache and Skype to co-exist on the same machine. How do I configure Apache to use other ports, or prevent Skype from listening on these ports?
To turn off and disable Skype usage of and listening on port 80 and port 443, open the Skype window, then click on the Tools menu and select Options. Click on the Advanced tab, and go to the Connection sub-tab. Untick or uncheck the checkbox for Use port 80 and 443 as an alternative for additional incoming connections option. Click on the Save button and then restart Skype to make the change effective.
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Closed 11 years ago.
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I have a machine running an ftp server and I'd like to access it from a machine located on another network behind a router only authorizing port 80.
I was thinking of a ssh tunnel like:
ssh -L local_port:${ftphost}:20 user#{sshhost}
Where ${sshhost} is another machine that have access to the ftp server ${ftphost}.
${sshhost} is reachable from my host while ${ftphost} is only reachable from ${sshhost} not mine.
Would that be the best solution ?
The O'Reilly Book "SSH, The Secure Shell: The Definitive Guide" contains a whole chapter about FTP Forwarding.
I think that should answer all of your questions.