Hello I can still reproduce this issue with release_16.10 I'm unable to preview some files (txt, pasted entry) until I have changed their type (ie : to tabular). I've switch off the feature but it seems to be better regarding performances so if you could help me to find why it doesn't work it would be nice. Thank you. Fred De : galaxy-dev [mailto:galaxy-dev-bounces@lists.galaxyproject.org] De la part de SAPET, Frederic Envoyé : mercredi 24 août 2016 17:19 À : galaxy-dev@lists.galaxyproject.org Objet : [galaxy-dev] Issue when using xsendfile with galaxy release_16.07 Hello I'm trying the latest Galaxy (git status gives me : # On branch release_16.07) I've set the xsend option in galaxy.ini (in order to run Galaxy behind a web server proxy, and apply all methods described here : https://wiki.galaxyproject.org/Admin/Config/ApacheProxy) apache_xsendfile = True HTML, gff3,tabular files are just fine but the preview of some other files (txt, csv) is broken on the interface. When I want to preview a txt file : Not Found The requested URL /datasets/fd1df6a9052810d5/display/ was not found on this server. And apache says : [Thu Aug 18 15:33:48 2016] [error] [client 192.168.29.12] (13)Permission denied: xsendfile: cannot open file: /softs/bioinfo/galaxy-prod/database/files/000/dataset_19.dat, referer: http: But it looks like this is not really a problem related to access. Indeed, from the same file, I switch it from txt to tabular (edit attributes), the preview works. Are you able to reproduce the behavior ? The same problem occurs on release_16.01. It's fine with the release v15.05 which is my production server right now. Fred