Vyacheslav

Google error “Failed to establish SSL secure connection to host”

Once, a user in Gmail set up mail import from a mail server running on iRedMail and received an error in response:

Configuring Dahua PFS4218-16ET

For example, I will configure the POE switch Dahua DH-PFS4218-16ET-190.

Using BNG Blaster

BNG Blaster is a testing tool, it can create thousands of virtual PPPoE and IPoE clients to test the performance of access servers, it also supports IGMP, QinQ, IPv6, etc.

Dovecot. Autoclean email in Trash

I will give an example of automatic deletion of emails that are in the Trash and Junk/Spam folder, by the way, you can delete emails in other folders in the same way.

Blocking SPAM behind a NAT server

In this article I will give an example of detecting and blocking the sending of spam messages behind a NAT server.

MikroTik backup script

In this article, I will give an example of a script for backing up the configuration of MikroTik devices.

Changing hostname after installing iRedMail

Once I installed iRedMail on one Ubuntu Server and later I had to change the domain that I specified during installation, so in this article I will describe where I changed it.

File mirroring script

Once I needed to make several mirrors in different countries for files that were often downloaded by users, so I made two scripts for synchronization.

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: