Question : Net Use returns "System error 64 has occurred. The specified network name is no longer available."

When I'm at work I use a .bat file for startup a script to connect a network drive on my home computer,and I just recently started getting this error when I try to run the script on login.

this is the .bat file :

net use T: \\marietto2008.no-ip.org\e /user:marietto /persistent:no

System error 64 has occurred. The specified network name is no longer available.

I use windows 7 in both sides.
also it doesn't works if I use the real ip address of my home computer. Marietto is the administrator of this computer. When I ping the hostname it returns the real ip address. At my home computer I shared the drive e and I set the permissions to everybody. I opened the router port 139 and 445. I closed the windows and the kaspersky firewall. At my work computer I closed the windows firewall. Maybe the router of my work computer blocks the outgoing connections ? how can I fix it ? Thanks.

Answer : Net Use returns "System error 64 has occurred. The specified network name is no longer available."

has your home ip address changed as if I ping your marietto2008.no-ip.org
I get 82.55.69.53 is that still correct