You’re attempting to add an additional web front-end server to your SharePoint 2010 farm and find out the passphrase you’ve documented is incorrect or it isn’t documented.
Resetting the passphrase is a fairly simple process. Open PowerShell and execute the following script. Enter the new passphrase when prompted:
$Passphrase = Read-Host -assecurestring "SP PassPhrase"
Set-SPPassPhrase -PassPhrase $Passphrase –Confirm
Most other blogs on this subject use the code shown in the image below, but why would you want the password to be shown in clear text when it’s typed into the textbox?
Confirm the new passphrase by typing it in again:
Click “Yes” and the passphrase will be reset to whatever you entered in the steps above: