If you able to ping non domain remote machine then you can use below one for deployment...
Domain : Workgroup or .\
Make sure "\\computer-name\admin$" page is accessible
20141002022014 E #04448 NAIMSRV Failed to authenticate to \\LAPPY2..\, err=87 20141002022014 E #04448 NAIMSRV Push Agent Installation Program to LAPPY2 failed
its not working, i still get this error, i even tried "\\computer-name\admin$" , its accessible but agent is not getting deployed
Installing agents for workgroup systems is recommended to go with local install.
Since, it fails to reach the DNS, hence you will see err=53 while deploy agents.
As, it is same with attached screenshot.
Alternatively, you can type .\ in the domain column and create the administrator or any unique user with member local admin group and password.
Try with domain.\ with administrator and with password, this may works but still not 100%.
Apart from this, I suggest to copy the framepkg.exe from the db\software folder on epo server to one share location OR copy "framepkg.exe" to client machine and install.
Framepkg.exe file path on epo server as below.
<EPO installed folder>\db\software\current\epoagent3000\install\0409\ "framepkg.exe" file
I hope this make sense...