Question: Are there any issues accessing a log file on a UNC Connection (mapped network drive)?
Answer: Urchin services run as LocalSystem by default, which is an account that has no credentials. In order for UNC connections to work, those credentials need to be inherited from a user on the local system that Urchin runs on. I’m guessing that user doesn’t exist on your Urchin system.
Try this: add a user named ‘urchin’ to the Urchin system, with the same password that you’re using on the remote system. Log in as this ‘urchin’ user once on the Urchin system. Now try running Urchin for the profile with the failed UNC connection and see what happens.