OS X attempting to connect to non-existent server
You may be able to hunt down the problem by creating a second admin user.

If the problem vanishes logging in as the second (admin) user, it's probably related to an item/setting in the realm of the first user.

If the problem persists it's probably related to a system-wide setting/start-up item (e.g. a launch daemon/agent).



In the first case you can disable several items (e.g. user related Login Items/StartupItems/LaunchAgents) and check if the problem persists.

A second source of error may be an (old) self-referential link of a local share to the local folder of a cloud storage, file synchronization or personal cloud service (e.g. in Dropbox, iCloud or even some Adobe Online service).

In the second case check the folders /Library/LaunchAgents, /Library/LaunchDaemons or /Library/StartupItems for suspicious plists/files.