Symptom
While using the Parallels Client on Windows XP Machine you will the following error:
[2825] Network Level Authentication Error

Cause
Windows XP does not support Network Level Authentication.
Workaround
The issue may be workaround by performing the steps below:
- Open Registry Editor (regedit).
-
Navigate to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
-
Modify the key named Security Packages
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Add tspkg to the listing of security packages.
Note: Do not remove any packages.
-
Modify the key named SecurityProviders
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders
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Add credssp.dll to the listing of Security Providers.
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