Dovecot: Disconnected, connection closed, auth failed

 From webmin dashboard>Servers>Postfix Mail Server> Virtual Domains> Find specific user maping 

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How to append one file from multipe file in Linux

cat file1 file2 > file3

Fix: Wget HTTP request sent, awaiting response... 403 Forbidden

 wget --user-agent="Mozilla" https://www.domain.com/file.extension

or

 wget --user-agent="Mozilla" https://domain.com/file.extension

or

 wget --user-agent="Mozilla" www.domain.com/file.extension

How to add an additional IP address in Centos 7

Method -1:

Create file /etc/sysconfig/network-scripts/ifcfg-eth0:0 with the following content:

DEVICE=eth0:0
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.0.11
NETMASK=255.255.255.255

service network restart

Method-2:

Run the following command

ipadd your_ip

Example: ipadd 192.168.0.1

Sovled ! Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist

 # sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*

# sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*

or

# sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-Linux-*

# sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.epel.cloud|g' /etc/yum.repos.d/CentOS-Linux-*

How to set up VSFTPD Server and FTP Account in AlmaLinux

sudo dnf install vsftpd

sudo mv /etc/vsftpd/vsftpd.conf /etc/vsftpd/vsftpd.conf_original

sudo vi /etc/vsftpd/vsftpd.conf

Add the following code to vsftpd.conf:

-------------------------------

anonymous_enable=NO

connect_from_port_20=YES

dirmessage_enable=YES

local_enable=YES

local_umask=022

listen=NO

listen_ipv6=YES

pam_service_name=vsftpd

userlist_enable=YES

write_enable=YES

xferlog_enable=YES

xferlog_std_format=YES

-------------------------------

cat /etc/vsftpd/vsftpd.conf 

sudo firewall-cmd --zone=public --add-service=ftp --permanent

sudo firewall-cmd --reload

sudo systemctl restart vsftpd

sudo useradd -m testftpuser

sudo passwd testftpuser

sudo bash -c "echo TO CHECK WORKING OF FTP > /home/baycombd/FTP_CHECK"

chown -R testftpuser /home/testftpuser

Note: Up to this user can access FTP files via ftp client application like FileZilla