I have an issue where when I'm uploading files to my samba server which is also my gateway/NAT/firewall I get an error from the Windows client uploading the file: Cannot copy <XXX>: the specified name is no longer available. The server is still up and running at this point as is the service, smbd. I can go back and restart the upload.

This ONLY happens if I am uploading the file to the server from the client and I happen to open Firefox to start browsing. If left uninterrupted, there is no problem whatsoever. I can uploaded hundreds of gigabytes worth of data at 60 megabytes per second. But, if I try to go browse a website while doing so, boom: error.

Any ideas?

EDIT: This does not happen while downloading from the server. Only uploads seem to be affected at this point.

Just bumping this -- Any ideas?