jamesallen-cm

# Get a list of trusted hosts
Get-Item WSMan:\localhost\Client\TrustedHosts

# Note that these commands don't create a list of trusted hosts, it simply replaces the trusted host with what you set via the command. If you need to add multiple hosts, they need to be comma seperated

# Trust all computers in a domain
Set-Item WSMan:\localhost\Client\TrustedHosts *.contoso.com

# Turst a single machine
Set-Item WSMan:\localhost\Client\TrustedHosts -Value myserver