This was my another mirroring Project, but this time i got stuck with the following message:

Mirroring Setup = Principal and Mirror with NO WITNESS using HIGH SAFETY MODE (don’t ask)

The server network address "TCP://SERVER667.DOMAIN.DROP.com:5023" can not be reached or does not exist. Check the network address name and that the ports for the local and remote endpoints are operational. (Microsoft SQL Server, Error: 1418).

I Tried several Tricks of adding NT ID to both of these Servers as SYSADMIN. But Still did not work. I Tried Dropping the Mirroring and Re-Creating it again, but still the Same Issue. I also tried Changing the Ports, but no success.

Finally I checked these 2 Installation as these were fairly new and found the SQL Services were running as Local Services. I change them to use my usual DOMAIN Accounts and then tried setting up the Mirroring Again and it WORKED this time..

Some more issues related to mirroring are covered here nicely. I Like this guy. (In technological sense)

http://alan328.com/SQL2005_Database_Mirroring_Tutorial.aspx

Here is a Shot of Database Mirroring Monitor