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Error: Managed session has failed: An existing connection was forcibly closed by the remote host

  • Nov 11, 2026 7:44 AM UTC
  • 8 comments
  • 20 views

Module: [C:\Program Files\Veeam\Endpoint Backup\Veeam.EndPoint.Manager.exe]. File version: [6.3.2.1205], Assembly version: [6.0.0.0]
Private fix was not detected
CmdLineParams: [startmanagementbackupjob owner=[vbsvc] Normal b0c03620-4016-4c16-bd3c-ee643c76b14a fec21bfb-618a-4c23-b47e-ac474136600a 0ed8de8b-5b3c-4c11-8b89-113840dd9cdd 42eb58be-938a-4d50-88ab-0a7bbc4b4bb4 e9bf939b-8fd3-4d3b-baaa-643a26611c1a]
Network Interface, Name: Ethernet, Description: Nutanix VirtIO Ethernet Adapter, Interface Type: Ethernet, Operational Status: Up;
    Unicast IPAddresses: fe80::54b:4ecf:70e9:ecc5%5; 172.25.140.178;
    Gateway IPAddresses: 172.25.140.1;
Network Interface, Name: Loopback Pseudo-Interface 1, Description: Software Loopback Interface 1, Interface Type: Loopback, Operational Status: Up;
    Unicast IPAddresses: ::1; 127.0.0.1;
Network Interface, Name: isatap.{885C6DB5-6051-4F9F-ADBB-AFC2468080B2}, Description: Microsoft ISATAP Adapter, Interface Type: Tunnel, Operational Status: Down;
    Unicast IPAddresses: fe80::5efe:172.25.140.178%2;

[11.11.2026 13:07:50] <01> Info     Checking administrator rights as WindowsIdentity
[11.11.2026 13:07:50] <01> Info     [Polling] Enabling polling client for all connections in the current process
[11.11.2026 13:07:50] <01> Info     Connecting to VBR in managed mode
[11.11.2026 13:07:50] <01> Info     [FIReconnectsManager] Persistent reconnects are switched on
[11.11.2026 13:07:50] <01> Info     ------- Veeam Agent Job Started -------
[11.11.2026 13:07:50] <01> Info     Creating job process lock (b0c03620-4016-4c16-bd3c-ee643c76b14a)
[11.11.2026 13:07:50] <01> Info     Creating job process lock (Lock_b0c03620-4016-4c16-bd3c-ee643c76b14a)
[11.11.2026 13:07:50] <01> Info         Job event 'vaw_started' was opened for session 'fec21bfb-618a-4c23-b47e-ac474136600a'. Full event name: 'Global\vaw_startedvmjobeventfec21bfb-618a-4c23-b47e-ac474136600a'.
[11.11.2026 13:07:50] <01> Info         Job event 'vaw_ready2work' was created for session 'fec21bfb-618a-4c23-b47e-ac474136600a'. Event full name: 'Global\vaw_ready2workvmjobeventfec21bfb-618a-4c23-b47e-ac474136600a'
[11.11.2026 13:07:50] <01> Info         Job event 'vaw_finished' was created for session 'fec21bfb-618a-4c23-b47e-ac474136600a'. Event full name: 'Global\vaw_finishedvmjobeventfec21bfb-618a-4c23-b47e-ac474136600a'
[11.11.2026 13:08:50] <01> Error    Could not receive signal that job [b0c03620-4016-4c16-bd3c-ee643c76b14a] is ready to work. SessionId: [fec21bfb-618a-4c23-b47e-ac474136600a], Timeout: [60 sec]
[11.11.2026 13:08:50] <01> Info         Job event 'vaw_ready2work' was disposed. Session: 'fec21bfb-618a-4c23-b47e-ac474136600a'.
[11.11.2026 13:08:50] <01> Info         Job event 'vaw_started' was disposed. Session: 'fec21bfb-618a-4c23-b47e-ac474136600a'.
[11.11.2026 13:08:50] <01> Info     Registering TCP client channel [cat_tcp].
[11.11.2026 13:08:50] <01> Info     tokenImpersonationLevel: [Identification].
[11.11.2026 13:08:50] <01> Info     Registering TCP client channel [bs_tcp].
[11.11.2026 13:08:50] <01> Info     tokenImpersonationLevel: [Identification].
[11.11.2026 13:08:50] <01> Info     Remoting options: []
[11.11.2026 13:08:50] <01> Info     Registering TCP client channel [bstcp].
[11.11.2026 13:08:50] <01> Info     tokenImpersonationLevel: [Identification].
[11.11.2026 13:08:50] <01> Info     Opening user job mutex {AE9A1509-7327-4F62-BDEE-74FFD9E645C6}
[11.11.2026 13:08:50] <01> Info     Mutex {AE9A1509-7327-4F62-BDEE-74FFD9E645C6} doesn't exist in the system
[11.11.2026 13:08:50] <01> Info     Creating new user job mutex {AE9A1509-7327-4F62-BDEE-74FFD9E645C6}
[11.11.2026 13:08:50] <01> Info     Mutex {AE9A1509-7327-4F62-BDEE-74FFD9E645C6} was opened successfully
[11.11.2026 13:08:50] <01> Info     Executing with lease keep aliver
[11.11.2026 13:08:51] <01> Info     [LeaseKeeper] Created. LeaseId: [c752d498-f6d4-4401-b5d5-de223b191272], TTL: [300sec], ignoreExceptions: [False]
[11.11.2026 13:08:51] <01> Info     Creating Foreign DBManager
[11.11.2026 13:08:51] <01> Info     Connecting to remote VBR, ips: '172.25.180.151', port: '10005', sessionName: 'ManagedModeSession', certInfo: 'LocalCertificateThumbprint: , AgentServiceCertificateThumbprint: '.
[11.11.2026 13:08:51] <01> Info     System UUID retrieved from [Win32_ComputerSystemProduct]:UUID field
[11.11.2026 13:08:51] <01> Info     Trying connect to (AddressFamily: 'InterNetwork') IP addresses: ['172.25.180.151']
[11.11.2026 13:08:51] <01> Warning  Failed to connect to (AddressFamily: 'InterNetwork') IP addresses: ['172.25.180.151']. Trying another addresses.
[11.11.2026 13:08:51] <01> Warning  SSL connection exception: Unable to establish authenticated client-server connection. (Veeam.Backup.Common.SslConnectionException)
[11.11.2026 13:08:51] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignConnectionPool.Wait(WaitHandle waitObj, CConnectionState state, Int32 timeout, String timeoutError)
[11.11.2026 13:08:51] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignConnectionPool.TryConnectWithIPs(TcpClientConnectionOptions connectionOptions)
[11.11.2026 13:08:51] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignConnectionPool.CreateConnection()
[11.11.2026 13:08:51] <01> Warning  Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. (System.IO.IOException)
[11.11.2026 13:08:51] <01> Warning     at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
[11.11.2026 13:08:51] <01> Warning     at System.IO.BinaryReader.FillBuffer(Int32 numBytes)
[11.11.2026 13:08:51] <01> Warning     at System.IO.BinaryReader.ReadUInt32()
[11.11.2026 13:08:51] <01> Warning     at Veeam.Backup.Common.BinaryReaderExm.ReadCompressedString(BinaryReader self, Int32 maxSize, Encoding encoding)
[11.11.2026 13:08:51] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignAuthenticationProtocolV3.Authenticate(TcpClient client)
[11.11.2026 13:08:51] <01> Warning  An existing connection was forcibly closed by the remote host (System.Net.Sockets.SocketException)
[11.11.2026 13:08:51] <01> Warning     at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
[11.11.2026 13:08:51] <01> Info     Networking error: [Exception has been thrown by the target of an invocation.. An existing connection was forcibly closed by the remote host]
[11.11.2026 13:09:06] <01> Info     Trying connect to (AddressFamily: 'InterNetwork') IP addresses: ['172.25.180.151']
[11.11.2026 13:09:06] <01> Warning  Failed to connect to (AddressFamily: 'InterNetwork') IP addresses: ['172.25.180.151']. Trying another addresses.
[11.11.2026 13:09:06] <01> Warning  SSL connection exception: Unable to establish authenticated client-server connection. (Veeam.Backup.Common.SslConnectionException)
[11.11.2026 13:09:06] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignConnectionPool.Wait(WaitHandle waitObj, CConnectionState state, Int32 timeout, String timeoutError)
[11.11.2026 13:09:06] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignConnectionPool.TryConnectWithIPs(TcpClientConnectionOptions connectionOptions)
[11.11.2026 13:09:06] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignConnectionPool.CreateConnection()
[11.11.2026 13:09:06] <01> Warning  Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. (System.IO.IOException)
[11.11.2026 13:09:06] <01> Warning     at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
[11.11.2026 13:09:06] <01> Warning     at System.IO.BinaryReader.FillBuffer(Int32 numBytes)
[11.11.2026 13:09:06] <01> Warning     at System.IO.BinaryReader.ReadUInt32()
[11.11.2026 13:09:06] <01> Warning     at Veeam.Backup.Common.BinaryReaderExm.ReadCompressedString(BinaryReader self, Int32 maxSize, Encoding encoding)
[11.11.2026 13:09:06] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignAuthenticationProtocolV3.Authenticate(TcpClient client)
[11.11.2026 13:09:06] <01> Warning  An existing connection was forcibly closed by the remote host (System.Net.Sockets.SocketException)
[11.11.2026 13:09:06] <01> Warning     at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
[11.11.2026 13:09:21] <01> Info     Trying connect to (AddressFamily: 'InterNetwork') IP addresses: ['172.25.180.151']
[11.11.2026 13:09:21] <01> Warning  Failed to connect to (AddressFamily: 'InterNetwork') IP addresses: ['172.25.180.151']. Trying another addresses.
[11.11.2026 13:09:21] <01> Warning  SSL connection exception: Unable to establish authenticated client-server connection. (Veeam.Backup.Common.SslConnectionException)
[11.11.2026 13:09:21] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignConnectionPool.Wait(WaitHandle waitObj, CConnectionState state, Int32 timeout, String timeoutError)
[11.11.2026 13:09:21] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignConnectionPool.TryConnectWithIPs(TcpClientConnectionOptions connectionOptions)
[11.11.2026 13:09:21] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignConnectionPool.CreateConnection()
[11.11.2026 13:09:21] <01> Warning  Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. (System.IO.IOException)
[11.11.2026 13:09:21] <01> Warning     at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
[11.11.2026 13:09:21] <01> Warning     at System.IO.BinaryReader.FillBuffer(Int32 numBytes)
[11.11.2026 13:09:21] <01> Warning     at System.IO.BinaryReader.ReadUInt32()
[11.11.2026 13:09:21] <01> Warning     at Veeam.Backup.Common.BinaryReaderExm.ReadCompressedString(BinaryReader self, Int32 maxSize, Encoding encoding)
[11.11.2026 13:09:21] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignAuthenticationProtocolV3.Authenticate(TcpClient client)
[11.11.2026 13:09:21] <01> Warning  An existing connection was forcibly closed by the remote host (System.Net.Sockets.SocketException)
[11.11.2026 13:09:21] <01> Warning     at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
[11.11.2026 13:09:36] <01> Info     Trying connect to (AddressFamily: 'InterNetwork') IP addresses: ['172.25.180.151']
[11.11.2026 13:09:36] <01> Warning  Failed to connect to (AddressFamily: 'InterNetwork') IP addresses: ['172.25.180.151']. Trying another addresses.
[11.11.2026 13:09:36] <01> Warning  SSL connection exception: Unable to establish authenticated client-server connection. (Veeam.Backup.Common.SslConnectionException)
[11.11.2026 13:09:36] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignConnectionPool.Wait(WaitHandle waitObj, CConnectionState state, Int32 timeout, String timeoutError)
[11.11.2026 13:09:36] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignConnectionPool.TryConnectWithIPs(TcpClientConnectionOptions connectionOptions)
[11.11.2026 13:09:36] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignConnectionPool.CreateConnection()
[11.11.2026 13:09:36] <01> Warning  Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. (System.IO.IOException)
[11.11.2026 13:09:36] <01> Warning     at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
[11.11.2026 13:09:36] <01> Warning     at System.IO.BinaryReader.FillBuffer(Int32 numBytes)
[11.11.2026 13:09:36] <01> Warning     at System.IO.BinaryReader.ReadUInt32()
[11.11.2026 13:09:36] <01> Warning     at Veeam.Backup.Common.BinaryReaderExm.ReadCompressedString(BinaryReader self, Int32 maxSize, Encoding encoding)
[11.11.2026 13:09:36] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignAuthenticationProtocolV3.Authenticate(TcpClient client)
[11.11.2026 13:09:36] <01> Warning  An existing connection was forcibly closed by the remote host (System.Net.Sockets.SocketException)
[11.11.2026 13:09:36] <01> Warning     at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
[11.11.2026 13:09:51] <01> Info     Trying connect to (AddressFamily: 'InterNetwork') IP addresses: ['172.25.180.151']
[11.11.2026 13:09:51] <01> Warning  Failed to connect to (AddressFamily: 'InterNetwork') IP addresses: ['172.25.180.151']. Trying another addresses.
[11.11.2026 13:09:51] <01> Warning  SSL connection exception: Unable to establish authenticated client-server connection. (Veeam.Backup.Common.SslConnectionException)
[11.11.2026 13:09:51] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignConnectionPool.Wait(WaitHandle waitObj, CConnectionState state, Int32 timeout, String timeoutError)
[11.11.2026 13:09:51] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignConnectionPool.TryConnectWithIPs(TcpClientConnectionOptions connectionOptions)
[11.11.2026 13:09:51] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignConnectionPool.CreateConnection()
[11.11.2026 13:09:51] <01> Warning  Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. (System.IO.IOException)
[11.11.2026 13:09:51] <01> Warning     at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
[11.11.2026 13:09:51] <01> Warning     at System.IO.BinaryReader.FillBuffer(Int32 numBytes)
[11.11.2026 13:09:51] <01> Warning     at System.IO.BinaryReader.ReadUInt32()
[11.11.2026 13:09:51] <01> Warning     at Veeam.Backup.Common.BinaryReaderExm.ReadCompressedString(BinaryReader self, Int32 maxSize, Encoding encoding)
[11.11.2026 13:09:51] <01> Warning     at Veeam.Backup.ForeignBackupServiceClient.CForeignAuthenticationProtocolV3.Authenticate(TcpClient client)
[11.11.2026 13:09:51] <01> Warning  An existing connection was forcibly closed by the remote host (System.Net.Sockets.SocketException)
[11.11.2026 13:09:51] <01> Warning     at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
 

8 comments

  • Author
  • Not a newbie anymore
  • Nov 11, 2026 7:45 AM UTC

need help to fix the above issue


lukas.k
Forum|alt.badge.img+12
  • Influencer
  • Nov 11, 2026 7:50 AM UTC

Hi ​@arunn7,

We need more information on this, ideally not just a very long log snippet.

What exactly are you trying to do? Which Veeam / Agent versions are you using? Which hypervisor versions are you using?

Please keep in mind that this community isn’t able to provide technical support - in case required, please reach out to Veeam Support.

 

Anyways, happy to help, but help us paint the full picture here.

 

Best

Lukas


  • Author
  • Not a newbie anymore
  • Nov 11, 2026 9:26 AM UTC

Thanks for your response. window agent backup getting failed with below error. all are physical servers. when the backup start as per the schedule failed with below eorr

1:39:52 PM    Error: Managed session has failed: An existing connection was forcibly closed by the remote host     
1:39:59 PM    Processing finished with errors at 11/11/2026 1:39:59 PM     
 

we need help for fix the issue. 


lukas.k
Forum|alt.badge.img+12
  • Influencer
  • Nov 11, 2026 9:54 AM UTC

Thanks for your response. window agent backup getting failed with below error. all are physical servers. when the backup start as per the schedule failed with below eorr

1:39:52 PM    Error: Managed session has failed: An existing connection was forcibly closed by the remote host     
1:39:59 PM    Processing finished with errors at 11/11/2026 1:39:59 PM     
 

we need help for fix the issue. 

What is your backup target? What is the OS version of the source machine? What is your Agent version? Is the Agent VBR-managed?

 

From the message “An existing connection was forcibly closed by the remote host” my take would be a networking or firewall issue. Please make sure to follow all port requirements: https://helpcenter.veeam.com/docs/agentforwindows/userguide/ports.html?ver=13

 

Also, I strongly suggest to open a Veeam Support ticket.


Chris.Childerhose
Forum|alt.badge.img+23

More information like Lukas said but create a support ticket too.  Keep in mind community is not support so we can only give suggestions not technical support.


lucasmagnum
Forum|alt.badge.img
  • Comes here often
  • Nov 11, 2026 11:59 AM UTC

​@arunn7 hi my friend! 

I have encountered a similar issue before, where the root cause was related to blocked ports required by the client's tool. Initially, we were informed that the ports had been properly opened; however, after a more in-depth investigation, we identified that some ports were still being blocked.

In any case, as mentioned earlier, I recommend opening a support ticket so that the responsible teams can assist with the investigation and help identify the root cause of the issue.


  • Author
  • Not a newbie anymore
  • Nov 11, 2026 12:32 PM UTC

Thank you for your suggestions. We already have an open support case with Veeam. The assigned Veeam engineer has not been able to identify or fix the issue so far, and the case has now been escalated to the Escalation Engineering team. We are currently waiting for an update from them.


Chris.Childerhose
Forum|alt.badge.img+23
  • Veeam Legend, Veeam Vanguard
  • Nov 11, 2026 12:57 PM UTC

Sounds good. Let us know if they get it fixed and share this with the community to help others that may come across this.