Linux – Page 9

Solution “Client did not reuse SSL session from control channel, rejecting data connection”

I once ran ProFTPd with TLS and users connected successfully, but one client was trying to transfer files via cURL and got the error:

Solution “111 Connection refused while connecting to upstream”

Once I noticed an error in the /var/log/nginx/error.log:

How to return ethX names to network interfaces

I will give an example of returning the old scheme of names of network interfaces in the Linux operating system.

How to compile cURL on Ubuntu

Once it was necessary to compile the newest version of cURL, because there was a bug in the standard version from the Ubuntu Server 20.04 repository, and in the new version it was fixed.

iRedMail. Change password complexity

I will give an example of changing the requirements for password complexity in iRedAdmin, they are used to check the entered password, for example, when creating a user or simply changing a password for a user. However, I do not recommend downgrading them.

Configuring RPS (Receive Packet Steering)

Receive Packet Steering (RPS) is a software implementation of RSS. Useful for example when there are fewer interrupts on the network interface than the processor cores.

Solution for ImportError: No module named web

Once I needed to disable the Nginx web server on the same server with iRedmail and install Apache2. And when I tried to start iRedadmin, it did not open, and in the Apache2 logs I saw:

iRedMail. Adding a catch-all account

One customer once asked to set up a forwarding of all email from non-existent addresses in his domain to a specific email address, this is usually called catch-all or luser_relay in postfix.

How to add Alias to iRedMail

Once, on the same mail server with iRedMail, I needed to redirect mail from the old domain to the new one, so I decided to add an alias so as not to lose contact with clients who will write to the email addresses of the old domain.

Configuring FTPS in ProFTPd

I will give an example of configuring FTPS in ProFTP, and prohibit simple connections without encryption.