Trouble connecting to your headless CrashPlan instance? CrashPlan just recently pushed version 4.3.3 which again may have changed your unique synchronization key.
Although I am quite fond of CrashPlan, I dislike the way the program handles updates. Each time CrashPlan is updated you will need to update the .ui_info file permitting the client to talk to the server. If these two files mismatch, you won’t get any errors, but will be stuck on the CrashPlan splash screen.
If you are on Windows I suggest using WinSCP (or any other SCP-compatible software). Open WinSCP, select the SCP protocol, enter your servers IP-address, username (root) and password and hit Login. The file we are interested in is located at /var/lib/crashplan/.ui_info . Navigate to this folder and download the file to C:\ProgramData\CrashPlan\.ui_info overwriting the existing file.