This happens on True Image Echo Workstation as well. Happens trying to connect a windows XP Pro machine to a Windows XP Pro computer.
Acronis true image managent console install on windows server 2003 sp1，

One windows agent install to windows 2003 sp2 server, and anthor agent install on redhat 4.0.
TIS version is V9.5 build 8,018.

I got this error message when i tried to connect to remote windows agent computer “Username or password is incorrect - Specify correct logon information for remote computer…”

i’m sure the username and passwd is correct ,and the user is administrator.

This answer works for TIS Workstation as well:
Could you please do the following:

Open the registry browser, navigate to

HKEY_LOCAL_MACHINE\SOFTWARE\Acronis\Encryption\Server,

rename the “Server” folder to “Server1″

Don’t forget to restart the Acronis Remote Agent Service after you make the change! (On the remote machine. You did install the agent before you tried to connect didn’t you?)

Olan Butler
Chief Architect
BHO Technologists
913-233-9590