New-PSSession - Connecting to remote server failed - powershell

Question

I have two Windows 7 Pro systems, one host system and one in a VM one the host system. I am trying to create a New PSSession on the host system to control the guest, both of which run Powershell 4.0.
As we have a DHCP setup in the office the first thing I do is establish the IP adress of each. Then I run the code below on both machines -
Set-Item wsman:\localhost\client\trustedhosts "$relevantIP" -Force
I then test that the systems are ready using WSMan on the host -
Test-WSMan $remoteIP
wsmid : http://schemas.dmtf.org/wbem/wsman/identity/1/wsmanidentity.xsd
ProtocolVersion : http://schemas.dmtf.org/wbem/wsman/1/wsman.xsd
ProductVendor : Microsoft Corporation
ProductVersion : OS: 0.0.0 SP: 0.0 Stack: 3.0
All this works perfectly well. At this point I used to create a new PSSession using the following
$credObject =
$Host.ui.PromptForCredential(
"Need credentials",
"Please enter password for the following IP $remoteIP",
$remoteUsername,
""
)
$remoteSession = New-PSSession -ComputerName $remoteIP -Credential $credObject
New-PSSession : [10.141.114.91] Connecting to remote server
10.141.114.91 failed with the following error message : The WinRM client cannot process the request. Default authentication may be used
with an IP address under the following conditions: the transport is
HTTPS or the destination is in the TrustedHosts list, and explicit
credentials are provided. Use winrm.cmd to configure TrustedHosts.
Note that computers in the TrustedHosts list might not be
authenticated. For more information on how to set TrustedHosts run
the following command: winrm help config. For more information, see
the about_Remote_Troubleshooting Help topic. At line:1 char:18
+ $remoteSession = New-PSSession -ComputerName "10.141.114.91" -Credential "SESA40 ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : OpenError: (System.Manageme....RemoteRunspace:RemoteRunspace) [New-PSSession],
PSRemotingTransportException
+ FullyQualifiedErrorId : CannotUseIPAddress,PSSessionOpenFailed
I have no idea why it has started doing this when trying to connect to the VM from the host system. I can create a new PSSession on the host machine from within the guest but no longer the other way around.
The error message says that "Default
authentication may be used with an IP address under the following conditions: ... the destination is in the TrustedHosts list and explicit credentials are provided." I have already added the correspoding IP to each WSMan TrustedHosts fields and provide explicit credentials.
Any help would be greatly appreciated as I am scratching my head trying to think of what could be wrong.
Update
After following the suggestion of one commentor I tried using different authentification methods.
$remoteSession = New-PSSession -ComputerName "10.141.114.91" -Credential "Test" -ErrorAction Stop -Authentication Basic
The WinRM client cannot process the request. Unencrypted traffic is currently
disabled in the client configuration. Change the client configuration and try the request again.
So I ran set-item WSMan:\localhost\Client\allowunencrypted $true on both machines. Now trying to get a PSSession gives the error
Get-PSSession -ComputerName "10.141.114.91" -Credential "Test" -Authentication Basic
The WinRM client cannot process the request. If the authentication scheme is
different from Kerberos, or if the client computer is not joined to a domain, then HTTPS transport must be used or the destination machine must be added to the TrustedHosts configuration setting.
** Update 2 **
In case anyone has the same problem and comes across this - my problem turned out to be a combination of a network fault and then with my playing around somehow creating a list of IP addresses for wsman:\localhost\client\trustedhosts which missed a comma between IP's.