Dev {Tricks}

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Plesk for Linux

Resending all deferred emails via Plesk interface

Go to Tools & Settings > Scheduled Tasks > Add Task.

/usr/sbin/postsuper -r ALL

Click Run Now.

 

 

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Possible attack detected. This action has been logged. How to fix ?

Remote API call fails with IDS security error

Calls to the ISPConfig remote API fail with error “Possible attack detected. This action has been logged.”.

Workaround:

Edit the file /usr/local/ispconfig/security/security_settings.ini and disable the IDS by changing these two values from ‘yes’ to ‘no’:

ids_anon_enabled=no
ids_user_enabled=no

or install an ISPConfig version where this issue is marked as fixed.

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Missing vmail Folders .Sent, .Trash, .Drafts, .Junk, and Other

  • Missing Sent, Trash, Drafts, Junk, and Other Folders

Solution: Check whether the dot files are hidden. Make the dot files to show.

Horde

  • Click on the Folder Actions option.
  • Choose the Rebuild Folder List option.
  • Then choose the Show All Mailboxes option.

Roundcube

  • Go to Settings.
  • Click Folders.
  • Re-subscribe to each folder by clicking the check box.

Windows Mail

  • Click IMAP Folders.
  • In the Show/Hide IMAP Folders dialog box, select a folder.
  • Click Show.

Thunderbird

  • In the Folder pane, look for IMAP mail and right-click on it.
  • Go to Settings, click on Server Settings, then select Advanced.
  • Remove the checkmark on Show only Subscribed folders.
  • Click OK.

Microsoft Outlook Express

  • Under Folders on the left side of the screen, select the inbox for your email (NOT the one under Local Folders).
  • Click the Tools menu, then select IMAP Folders.
  • Select the desired folder(s).
  • Click Show.
  • Click OK.

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How to Add and Remove Swap Space on Ubuntu 20.04

Generally, the size of the swap file depends on how much RAM your system has:

  • Less than 2 GB RAM – 2 times the amount of RAM.
  • 2 to 8 GB RAM – the same size as the amount of RAM.
  • More than 8 GB RAM – at least 4 GB of Swap.

Only root or user with sudo privileges can activate the swap file.

1). First, create a file that will be used as swap:

sudo fallocate -l 2G /swapfile

2). Set the file permissions to 600 to prevent regular users to write and read the file:

sudo chmod 600 /swapfile

3. Create a Linux swap area on the file:

sudo mkswap /swapfile

4). Activate the swap file by running the following command:

sudo swapon /swapfile

5). To make the change permanent open the /etc/fstab file:

sudo vi /etc/fstab

and paste the following line:

/swapfile swap swap defaults 0 0

6). Verify that the swap is active by using either the swapon or the free command, as shown below:

sudo swapon --show

and

sudo free -h

Adjusting the Swappiness Value

On Ubuntu, the default swappiness value is set to 60. You can check the current value by typing the following command:

cat /proc/sys/vm/swappiness

While the swappiness value of 60 is OK for most Linux systems, for production servers, you may need to set a lower value.

sudo sysctl vm.swappiness=10

To make this parameter persistent across reboots, append the following line to the /etc/sysctl.conf file:

vm.swappiness=10

Removing a Swap File

To deactivate and delete the swap file, follow these steps:

1). First, deactivate the swap space:

sudo swapoff -v /swapfile

2). Next, remove the swap file entry from the /etc/fstab file.

/swapfile swap swap defaults 0 0

3). Finally, remove the actual swapfile file using the rm command:

sudo rm /swapfile

 

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Xauthority does not exist

  • /usr/bin/xauth: file /root/.Xauthority does not exist

Solution

Go into the sshd_config file

vi /etc/ssh/sshd_config

Search and remove the # sign at the beginning of the 3 lines

X11Forwarding yes
X11DisplayOffset 10
X11UseLocalhost yes

Then restart sshd

systemctl restart sshd

Exit and login again. You will not get the error.

 

Or

Create n new file: touch ~/.Xauthority

Log out and login in again.