Thank you for the reply.

 

Q:  You are referring to Auto Backup function of the controller, correct?   

A:  Yes

 

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Q:  May I have the controller version you are testing? 

A:  Model OC200  and ER7212PC  This is the same across multiple controller types (oc200 and er7212pc), multiple hardware versions (v1 vs v2), and firmware versions.  If you are asking for one precision combination out of all of that then let's just choose the original one where it worked for 1 backup and now fails to even connect:  Model:  OC200 v2 5.13.30.20    2.14.4 Build 20240304 Rel.54311

 

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Q:  If you login your file server through filezilla client, can you find that backup file? Or it's totally disappear from the file server(like be deleted)?

A: the backup file is still there.  the behavior is when i go to the controller interface now, a circle spins for ~30 seconds, then show blank where the file(s) should show up in the list.  If i try to click browse or save it gives the same spinning circle for ~30 seconds, times out and reverts to whatever was originally saved for the configuration, which in this case is scp with all the same settings.  You see, when I was originally trying to input the configuration and get it to work, I tried multiple settings (i.e. no port, port 22, and then port 2246-which is our designated port, hostname/ then ip, etc)  and then tried scp protocol.  What was weird is the config saved with scp as the protocol (did work to actually back up though) and then i changed to sftp and put in the same host, port, user, and pass and it saved (got 'succeeded' banner at the top) and I was able to connect and browse the remote server filesystem.

 

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Q:  If possible, please let me know the name of that "hosted storage solution“, so I can run the test on my end. I do only have a local file server to test right now and I did not see any problem with it.

A:  The company is called Veerotech.  It is there ftp/ssh storage solution:  wwwDOTveerotechDOTnet/storage

As I mentioned previously, when i export logs i see the sftp connection failures, along with java exceptions, java stack dump, and other associated error entries. 

I tried to post them in the original post, but when trying to submit it kept complaining about a invalid character and would not submit.  I can try to upload again if helpful or curious.

 

for essentially here are the connection and java errors:

Here are sftp connection and java errors examples:

05-16-2024 18:43:05.561 WARN [proxy-handler-thread-105]  c.t.s.o.b.c.c.a.f(): Fail to connect to SFTP server, omadacId= com.jcraft.jsch.JSchException: java.io.IOException: Pipe closed

 

05-16-2024 15:17:38.484 WARN proxy-handler-thread-271 c.t.s.o.b.c.c.a.f(): Fail to connect to SFTP server, omadacId=

com.jcraft.jsch.JSchException: session is down

 

05-16-2024 13:20:22.518 WARN [proxy-handler-thread-9]  c.t.s.o.b.c.c.a.f(): Fail to connect to SFTP server, omadacId=

com.jcraft.jsch.JSchException: timeout: socket is not established Here is scp:  error entry too:

 

05-16-2024 16:43:13.805 WARN [proxy-handler-thread-89]  c.t.s.o.m.c.b.a.a.b.c(): File server connect failed, omadacId=

 

I would include the success but combing there log, I don't seem to be able to identify a stream/pattern for the actual successful connection. I am working with a tech at the hosting company, but they swear they do not see anything but the successful connections from my filezilla client and ip. At this point I am not sure if this is an incompatibility of 'sftp client/program/java code' of tplink, the hosting provider, or combination.  Either way it should not be this difficult to setup secure remote backups