Hi Adam, I have not been able to figure out is the exact issue you are encountering, but if you can diagnose it and perhaps provide some test code that reproduces it, we will certainly try and see how to make it work.
That being said, a few remarks on this issue: >> have been implementing various nio filesystems If indeed the file that SSHD is trying to query about its permissions is on some proprietary implementation, then this needs to be debugged by the specific file system in order to see if it "mis-behaves" somehow (see more below). >> I can’t tell if there is an issue here or not, however, it may be one restricted to Windows I can say with a very high degree of certainty that the code works on standard Windows file systems without any problems - I personally tested this code on Windows 7, 8 and 10 without any issues - both FAT and NT. >> uses a file object if the views don’t contain the POSIX attribute The code attempts to emulate POSIX permissions by using File instead of Path if it detects the Windows file system. However, if the file resides on some special proprietary/custom file system, there may be problems. Which brings me back to the original suggestion - try and debug the issue. Should be fairly easy to set up a test code with a *main* that simply accepts some file path and then invokes org.apache.sshd.common.util.io.IoUtils.java#getPermissions. Simply try this code with various locations - some that reside on "suspicious" file systems and try to diagnose the issue. While we might not be able to fix it for you, we might be able to add some hooks into the code that you can use as a workaround for your specific issue (and hopefully others that may encounter similar problems). Once you have more concrete data - and perhaps an idea as to the hooks/workarounds you need, please open an SSHD issue on our JIRA site ( https://issues.apache.org/jira) - we will certainly try and see how we can help. Lyor G.
