Thanks Tim for your concern.
1. Have you ensured that any kind of firewall is disabled on the target machine before deployment?
Yes, I only have CIS installed. I disabled Comodo Firewall, that did not make any difference.
2. Ping ability is fine, but could you please verify that share \\targetmachine\admin$ is accessible from server machine? This is the most important check for us.
Yes, I am able to access that folder, it is opening "Windows" folder.
3. This likely means that problem is with the server machine.
To be more exact, I am now just trying to deploy agent on to the same system where both CESM and CIS are installed. So, it itself is the server, it is the client.
5. If deployment fails with error "bad username or password" and you are sure that login and password entered are correct then it likely you have not set forceguest and LocalAccountTokenFilterPolicy keys on the target machine, please check this.
The "forceguest" is already set to "0". The second one I thought was unnecessary (as the current user is in administrators group), but I did create it to verify, it does not make any change too.
This system configuration is Win7 x64 with UAC disabled. CESM 2.1 and CIS 5.10 installed and running. (Although the same failure occured on XP clients too, I am just trying to solve this test case first, as this is the simplest thing for me to do)