Parallels Client is failing to launch published application due to CredSSP error

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Symptoms

 

Cause

Resolution

Client-side

On the client PC, set the following GPO:

Computer Configuration > Policies > Windows Settings > Security Settings > Local Policies > Security Options > Network security: Restrict NTLM: Outgoing NTLM traffic to remote servers > set to Audit All

 

Note: Alternatively, you may configure Network security: Restrict NTLM: Add remote server exceptions for NTLM authentication policy setting to specify a list of remote servers to which client devices are allowed to use NTLM authentication while denying others.

Reference:

https://docs.microsoft.com/en-us/windows/security/threat-protection/security-policy-settings/network-security-restrict-ntlm-outgoing-ntlm-traffic-to-remote-servers

 

Server-side

Set the following GPO:

Computer Configuration > Policies > Windows Settings > Security Settings > Local Policies > Security Options > "Network security: Restrict NTLM: Incoming NTLM traffic" > set to Allow all

Note: Alternatively, you may create an exception list of servers to exclude from this policy setting Network security: Restrict NTLM: Add server exceptions in this domain.

 

Reference:

https://docs.microsoft.com/en-us/windows/security/threat-protection/security-policy-settings/network-security-restrict-ntlm-incoming-ntlm-traffic

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