Unable to repair broken IP in Plesk on Windows Server: Invalid mask parameter

Taras Ermoshin

Updated May 13, 2026 12:12

kb: bug Plesk for Windows kb: fixed

Symptoms

On a Plesk for Windows server, repairing broken IP in Tools & Settings > IP Addresses > Repair fails:

PLESK_ERROR: Error: ifmng failed: Execute netsh interface ipv4 add address Ethernet 203.0.113.2 32 failed[1]: Invalid mask parameter (32).
The IP address from the error does not exist in the system:

C:\> ipconfig |findstr 203.0.113.2

Product issue:

#PPPM-11763 "Fixed an issue where rereading IP addresses in Plesk caused the net masks for all IP addresses to be shown incorrectly."
Fixed in:
- Plesk Obsidian 18.0.78 12 May 2026 (Windows)

Please consider updating your server:

If update is not possible for some reason you may try the following

workaround

As a workaround add IP manually to the server:

Login to the server via RDP.
Add IP to the server manually:

C:\> netsh interface ipv4 add address Ethernet 203.0.113.2 255.255.255.255
Login to Plesk.
Go to Tools & Settings > IP Addresses and click Reread.