Dear cafe, not sure whether this is a bug or misusage on my part: I'm using stack lts-9.2, which entails directory-1.3.0.0. I have a file on a samba share, say /mnt/remote/foo. I read the file, modify its contents in my program and save a local copy, say /tmp/foo. Then I try to copy the modified file back to its original place using System.Directory.copyFile "/tmp/foo" "/mnt/remote/foo" Sometimes the copyFile command produces an error like this: /mnt/remote/.copyFile1804289383846930886.tmp: copyFile:atomicCopyFileContents:withReplacementFile:hClose: does not exist (Host is down) When I copy /tmp/foo to /mnt/remote/foo using the shell, everything works fine. Does anyone have an idea what goes wrong? Internally withReplacementFile is used which indeed creates a temporary file to not risk corrupting the original. Is this maybe due to a wrong ordering of IO actions? Thanks Olaf