nginx does not start automatically after a system reboot on a Plesk for Linux server: 99: Cannot assign requested address

Kuzma Ivanov

Updated September 02, 2026 10:28

Plesk for Linux kb: technical

Applicable to:

After system reboot, the websites do not load with the error:

PLESK_INFO: ERR_ADDRESS_UNREACHABLE
nginx service is in the failed state:

# service nginx status
...
Active: failed (Result: exit-code)
...
server.edhub.net nginx[1104]: nginx: [emerg] bind() to [2400:8901::f03c:91ff:fe24:7893]:443 failed (99: Cannot assign requested address)
Manual restart of the service is successful:

# service nginx start

# service nginx status | grep Active
Redirecting to /bin/systemctl status nginx.service
Active: active (running)

During the system boot, nginx service was started before IP addresses were assigned to the network interface.

RHEL/AlmaLinux-based distributions

Connect to your Plesk server via SSH.
Verify that network interfaces are enabled on system boot:

# grep -r "ONBOOT" /etc/sysconfig/network-scripts/ifcfg-*

/etc/sysconfig/network-scripts/ifcfg-lo:ONBOOT=yes
/etc/sysconfig/network-scripts/ifcfg-venet0:ONBOOT=yes
/etc/sysconfig/network-scripts/ifcfg-venet0:0:ONBOOT=yes
Create a copy of the nginx startup script /etc/systemd/system/multi-user.target.wants/nginx.service:

# cp /etc/systemd/system/multi-user.target.wants/nginx.service{,.bak}
Install the systemd-networkd package, if it is not installed:

# yum install systemd-networkd
Open nginx startup script in a text editor. For example, vi editor:

# vi /etc/systemd/system/multi-user.target.wants/nginx.service
Add the following line to the [Unit] section:

CONFIG_TEXT: After=network-online.target remote-fs.target nss-lookup.target
Save the changes and close the file.
Reboot the server:

# reboot

Debian/Ubuntu-based distributions

Connect to your Plesk server via SSH.
Verify that network interfaces are enabled on system boot:

# grep auto /etc/network/interfaces

# This configuration file is auto-generated.
auto lo
auto venet0
auto venet0:0
Create a copy of the nginx startup script /etc/systemd/system/multi-user.target.wants/nginx.service:

# cp /etc/systemd/system/multi-user.target.wants/nginx.service{,.bak}
Open nginx startup script in a text editor. For example, vi editor:

# vi /etc/systemd/system/multi-user.target.wants/nginx.service
Add the following line to the [Unit] section:

CONFIG_TEXT: After=network-online.target remote-fs.target nss-lookup.target
Save the changes and close the file.
Reboot the server:

# reboot
Check nginx status:

# service nginx status | grep Active

If nginx service did not start after the system restart with the new changes, apply additional step:

Add the following line in [Service] section in /etc/systemd/system/multi-user.target.wants/nginx.service file:

CONFIG_TEXT: ExecStartPre=/bin/sleep 10

Note: Increase the value, if 10 seconds timeout is insufficient.
Reboot the server:

# reboot