We have a company-wide tnsnames.ora file on a network share and all users have the same TNS_ADMIN system variable pointing to this share.
The SQL Developer extension does not recognize the file in this location and shows the “No TNS file found” error.
This is the log entry:
[10/20/25, 13:06:00.500] [Notification ] [ERROR] No TNS file found in: \\srcvsfdcfs88\tnsnames$\
I can work around this issue by copying the file to a local drive and pointing the extension to it, but I would expect it to work on a share, too. Never had a problem with a having the file on a share before.