I believe that the resolution to this problem is that the program to be used was specified without an absolute path. Hence, the server was not able to verify its existence. I agree that we should make that a requirement (.e. absolute path) but hat would likely break backward compatibility in instances where a relative path actually resolves the executable. So, I am closing this with the admonition to always use absolute paths. We will change the documentation to make this more clear. -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/1279#issuecomment-726671077 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-DEV list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1