Unable to connect to the remote server

Support
1

Hi everyone, first off thanks for reading.

I have 2 PCs at two different location, around the same time starts throwing up the same error as below. Am out of ideas why is that so… Appreciate any input thank you!

Failed: Unable to connect to the remote server
Details: System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 104.153.233.176:443
at System.Net.Sockets.Socket.InternalEndConnect(IAsyncResult asyncResult)
at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
--- End of inner exception stack trace ---
at Duplicati.Library.Main.BackendManager.List()
at Duplicati.Library.Main.Operation.FilelistProcessor.RemoteListAnalysis(BackendManager backend, Options options, LocalDatabase database, IBackendWriter log, String protectedfile)
at Duplicati.Library.Main.Operation.FilelistProcessor.VerifyRemoteList(BackendManager backend, Options options, LocalDatabase database, IBackendWriter log, String protectedfile)
at Duplicati.Library.Main.Operation.BackupHandler.PreBackupVerify(BackendManager backend, String protectedfile)
at Duplicati.Library.Main.Operation.BackupHandler.<RunAsync>d__19.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at CoCoL.ChannelExtensions.WaitForTaskOrThrow(Task task)
at Duplicati.Library.Main.Controller.<>c__DisplayClass13_0.<Backup>b__0(BackupResults result)
at Duplicati.Library.Main.Controller.RunAction[T](T result, String[]& paths, IFilter& filter, Action`1 method)

Log data:
2021-03-02 10:12:47 +08 - [Error-Duplicati.Library.Main.Operation.BackupHandler-FatalError]: Fatal error
System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 104.153.233.176:443
at System.Net.Sockets.Socket.InternalEndConnect(IAsyncResult asyncResult)
at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
--- End of inner exception stack trace ---
at Duplicati.Library.Main.BackendManager.List()
at Duplicati.Library.Main.Operation.FilelistProcessor.RemoteListAnalysis(BackendManager backend, Options options, LocalDatabase database, IBackendWriter log, String protectedfile)
at Duplicati.Library.Main.Operation.FilelistProcessor.VerifyRemoteList(BackendManager backend, Options options, LocalDatabase database, IBackendWriter log, String protectedfile)
at Duplicati.Library.Main.Operation.BackupHandler.PreBackupVerify(BackendManager backend, String protectedfile)
at Duplicati.Library.Main.Operation.BackupHandler.<RunAsync>d__19.MoveNext()
2 
C:\>nslookup api.backblazeb2.com 8.8.8.8
Server:  dns.google
Address:  8.8.8.8

Non-authoritative answer:
Name:    api.backblazeb2.com
Addresses:  104.153.233.176
          104.153.233.180
          206.190.215.15


C:\>

Presumably your destination Storage Type is B2 Cloud Storage. Can you test it to see what it can do?

C:\>ping 104.153.233.176

Pinging 104.153.233.176 with 32 bytes of data:
Reply from 104.153.233.176: bytes=32 time=90ms TTL=51
Reply from 104.153.233.176: bytes=32 time=85ms TTL=51
Reply from 104.153.233.176: bytes=32 time=88ms TTL=51
Reply from 104.153.233.176: bytes=32 time=90ms TTL=51

Ping statistics for 104.153.233.176:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 85ms, Maximum = 90ms, Average = 88ms

C:\>

Or browse to https://104.153.233.176 but don’t expect to interact with it. Just test for fast error or not.

If you have an antivirus on these two PCs that blocks sites, you might see if this address is being blocked.

Backblaze has had problems with some of its servers being blocked lately. They’re taking steps to resolve, however it should have been improved by Feb 23. Third-party IP blacklists might be harder to solve though.

3

You’re awesome sir for the swift reply!

Edit: Sorry, seems like it times out trying to go to https://104.153.233.176. But doesn’t seem like my AV is blocking them though…

Edit 2: Seems like the connection is just bad, high ping and also dropping…

C:\Users\Administrator>ping 104.153.233.176

Pinging 104.153.233.176 with 32 bytes of data:
Reply from 104.153.233.176: bytes=32 time=1109ms TTL=56
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 104.153.233.176:
    Packets: Sent = 4, Received = 1, Lost = 3 (75% loss),
Approximate round trip times in milli-seconds:
    Minimum = 1109ms, Maximum = 1109ms, Average = 1109ms
4

I doubt it, but I am not sure. If it connected fast then complained, that might be different from your original “Unable to connect to the remote server” issue. You said “PC”, so I guess this is Windows which doesn’t experience TLS issues as often as systems (e.g. Linux) using mono. Microsoft Edge’s complaint explains

This server couldn’t prove that it’s 104.153.233.176 ; its security certificate is from backblazeb2.com . This may be caused by a misconfiguration or an attacker intercepting your connection.

but actually it might just be that I called it by address, not name (trying to force use of a problem address). Certificates are name-based.

OK, I see you’re editing. That ping does look pretty bad. You could replace ping with tracert for a look…

5

Sorry, my apologies for the edit. The tracert fails too, this could really well be my connection maybe. Asked my friend to do it for me and his ran well.

Thanks for the brainstorming session @ts678 ! At least I know this is not a Duplicati problem now :slight_smile:

Thanks a lot!

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