There are no settings in the DameWare software that either cause or prevent a 1326 error. This error is generated by the operating system (OS). The error occurs when a DameWare product asks the OS on your local system to execute standard Microsoft Windows API calls to connect to a remote system.
If you see this error in Remote Support, you will also see it if you try to map a drive to the admin$ share on the remote system from outside of Remote Support.
If the remote system is running Windows XP, make sure that "Simple File Sharing" is disabled. Simple File Sharing only exists within Windows XP, and should not be confused with File & Printer Sharing which exists in all Operating Systems.
To disable Simple File Sharing in Windows XP Professional:
Open My Computer.
Select Tools > Folder Options.
Click the View tab.
Disable Use simple file sharing (Recommended).
Another option is to adjust the "ForceGuest" policy setting on the remote system to make sure all users authenticating to it over the network are actually authenticating as themselves, and not as the Guest account.
To fix this policy in the Local Security Policy of the remote system:
Open Control Panel > Administrative Tools > Local Security Policy.
In the left pane, select Security Options.
In the right pane, select Network access: Sharing and security model for local accounts, and then click Action > Properties.
Select Classic – local users authenticate as themselves.