My networks accounts recover without any problem after sleeping as long as the duration is short (a couple of minutes). If the machine wakes up after - let say 15 minutes - the networks accounts do not find the home directory and the computer reacts very slow. In this case logging out and loggin in resolves the problem. However, this is annoying.
I tried to solve the issue by reseting the CMS, deleting the DNS cache, etc. Any other idea where I could take a look? Thanks
The server is a mac mini with 10.8.2. No additional software installed. DNS is working.
Looking at the following document http://support.apple.com/kb/HT3774 pointed me to the right direction.
In System Preferences, Energy Saver, deselect "Wake for network access". Voila! Now the problem is gone.