"Thumbs up" to the advice above.
You may also be able to see what server files are downloaded from in the log.liveupdate. If the downloads have come from an Internet or internal LiveUpdate server, you will see the servername or IP under the SERVER SELECTION line in the log.
If the "server" is a directory on the SEP client itself, then the downloads came from a SEPM or GUP on your network.
Please do update this thread with any additional questions, or mark it "solved" for the benefit of future admins! &: )