Debian 7 Segmentation Fault. in Linux-Server Posted February 15, 2015 Had this problem the other day, figured it could help you. In your FTP client, make sure the files are transferred in binary mode, and not ASCII or even auto (FileZilla on my machine was set to auto and didn't detect that it was an executable). When transferred as ASCII, the mta-server (or mta-server64) executable gets corrupted, and running it produces a segfault. Hope this helps.