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Several common applications frequently clash with Veeam over Port 443.
Before changing any settings, you need to find the exact process ID (PID) and the name of the software using port 443.
: Frequently conflicting services include IIS (Internet Information Services) , Hyper-V Replication , Remote Desktop Web Access , or third-party security agents like Qualys . Solutions and Workarounds Launch your backup console or web interface to
Look for lines showing LISTENING . The number at the very end of that line is the .
Launch your backup console or web interface to confirm successful connectivity.
netstat -ano | findstr :443
Once the port is free, restart your Veeam services via services.msc or restart the Veeam installation wizard. Best Practices for Veeam Deployments
Get-NetTCPConnection -LocalPort 443 | Select-Object LocalAddress, LocalPort, RemoteAddress, RemotePort, State, @Name="ProcessName";Expression=(Get-Process -Id $_.OwningProcess).ProcessName Use code with caution. Step 2: Common Culprits and How to Resolve Them
Microsoft Internet Information Services (IIS) is one of the most common culprits. Many organizations host their internal websites on the same server, and IIS binds to port 443 by default. go to the Details tab
The critical error occurs when the default HTTPS port (443) needed by the Veeam cloud and web services is already bound to another piece of software on the backup server.
(Alternative: Open , go to the Details tab, and sort by the PID column to find the process.) Step 2: Common Culprits and How to Handle Them