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Today my Synology can't login in DSM!!! First, I named it as synology_A. There is another Synology it works well,named it as synology_B. synology_A info: Product:DS3617xs Version:DSM 6.1.5-15254 Update 1 bootloader:DS3617xs 6.1 Jun's Mod V1.02b Then I telnet in Synology telnet x.x.x.x sudo -i #login in as root, password is same as admin. Then I compare synology_A and synology_B's Process.I find synology_A has many [defunct] process. root@synology_A:~# ps -ef | grep cgi root 2948 10340 0 Mar20 ? 00:00:00 [synoscgi_______] <defunct> root 10280 1 0 Mar19 ? 00:00:08 /usr/syno/sbin/synocgid -D root 10340 1 0 Mar19 ? 00:00:26 synoscgi system 10470 10340 0 Mar19 ? 00:00:00 synoscgi system 29109 10340 0 17:28 ? 00:00:00 synoscgi root 29180 29148 0 17:30 pts/5 00:00:00 grep --color=auto cgi system 31659 10340 0 Mar20 ? 00:00:00 synoscgi system 31834 10340 0 Mar20 ? 00:00:00 synoscgi system 31924 10340 0 Mar20 ? 00:00:00 synoscgi Kill the parent process: root@synology_A:~# kill -9 10340 root@synology_A:~# ps -ef | grep cgi root 10280 1 0 Mar19 ? 00:00:08 /usr/syno/sbin/synocgid -D root 29205 29148 0 17:30 pts/5 00:00:00 grep --color=auto cgi Then I start up the process 'synoscgi' root@synology_A:~# synoscgi synoscgi: error while loading shared libraries: /lib/libsynoshare.so.6: invalid ELF header Hahahaha,the 'libsynoshare.so.6' is a invalid ELF header. I use shell compare synology_A and synology_B's Directory '/lib' I find there is two file is different!. synology_A: fc6a81a0cef83cc98e7af02e068646ec ./libsynoshare.so.6 657ad98f8a46e0961804b3ad69ff257e ./libsynopkg.so.1 synology_B: 8efad47899b4eeaaccebb6efb5cf8ddc ./libsynoshare.so.6 5bb625ce2b7193e3a2cc3637cd33c7ec ./libsynopkg.so.1 Ok,Try to copy synology_B's file to synology_A. root@synology_A:~# scp root@x.x.x.x:/lib/libsynoshare.so.6 /lib/libsynoshare.so.6 root@synology_A:~# scp root@x.x.x.x:/lib/libsynopkg.so.1 /lib/libsynopkg.so.1 Start the process,it works!: root@synology_A:~# synoscgi Copyright (c) 2003-2018 Synology Inc. All rights reserved. Usage: synoscgi (Version 15254) --help: this help --mode: scgi|apid (required) run as synoscgi or synoapid scgi related params: --idle-child={childNumber} (optional, default: 10) max idle child number --max-child={childNumber} (optional, default: 65535) max child number apid related params: --conf (required) apid config realpath Then Reboot it! root@synology_A:~# init 6 Finally synology_A comes back to life! I can login again. Note: 1. The above two files you can ask someone to send to you. 2. You can test let /lib/libsynopkg.so.1 /lib/libsynoshare.so.6 have no write authority like this: chmod u-w /lib/libsynopkg.so.1 chmod u-w /lib/libsynoshare.so.6 I have not test above. 3. You can use scp \ wget \ curl to download files into Synology. Or use usb storage mount or use Samba (Samba is also working) 4. If you have not enabled telnet or ssh server, you can't login in. You can Use 'Linux SystemRescue' iso write to usb storage to bootloader into SystemRescue, then copy two files into Synology's filesystems