Symptoms
Can't add an IP address in Plesk > Tools & Settings > IP Addresses
Cannot add the IP address 203.0.113.2. This network interface obtains IP addresses automatically.
Cause
Static IP addresses cannot be added to DHCP network interfaces.
Resolution
Change the network interface to static.
Note: It is highly recommended to perform this task during maintenance time.
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Connect to the server via RDP.
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Get the current DHCP IP addresses from IPv4/IPv6 Addresses, Subnet Mask, Default Gateway, DNS Servers with this command
ipconfig /all
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Go to Control Panel > Network and Internet > Network and Sharing Center > Change adapter settings > example_interface > Properties > Internet Protocol Version 4|6 (TCP/IPv4|IPv6).
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Select Use the following IP address
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Add the IP addresses from Step 2
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Press OK