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2020-04-20 13:04:14 +0000 commented answer What would cause a RST,ACK from client to SMB server?

It still shows as SMB2, but as long as it works!

2020-04-20 02:28:50 +0000 commented answer What would cause a RST,ACK from client to SMB server?

I can only choose Smb2, or Smb2 with large MTU support, as the minimum SMB version. I've increased my max to SMB3 though

2020-04-19 10:10:50 +0000 commented answer What would cause a RST,ACK from client to SMB server?

Yup it's a home network. Thanks!

2020-04-19 09:44:48 +0000 commented answer What would cause a RST,ACK from client to SMB server?

OMG you are a lifesaver. Changing this setting to "Allow all" immediately solved the problem! I don't remember ever chan

2020-04-19 09:42:30 +0000 marked best answer What would cause a RST,ACK from client to SMB server?

Hi, I'm trying to troubleshoot a problem I have with a Windows PC connecting to an Synology DS218J NAS on SMB2. I keep getting errors whether connecting via hostname or IP address directly, even when Windows Defender firewall is disabled. The NAS server is working fine as I can access its web portal from the same PC, and I can also access the SMB file shares with other mobile devices/laptops. I've tried looking at the SMB version settings (SMB2 is enabled on the NAS), and even did a Network Reset on the PC, but still no go, so I decided to delve deeper by looking at a packet capture.

What I see when I try to connect to the NAS on Windows Explorer, is the following:

  1. TCP 3-way handshake ([SYN],[SYN,ACK],[ACK])
  2. Negotiate Protocol Request from PC to NAS
  3. TCP ACK from NAS to PC
  4. Negotiate Protocol Response from NAS to PC
  5. [RST,ACK] from PC to NAS

Steps 1-5 will then repeat twice (total 3x) before ultimately failing.

What could be wrong here? Is it a TCP problem, an SMB problem or some other problem?

Attached screenshot of the negotiate protocol response from the server. image description

2020-04-19 09:42:29 +0000 received badge  Scholar (source)
2020-04-19 09:42:26 +0000 commented answer What would cause a RST,ACK from client to SMB server?

OMG you are a lifesaver. Changing this setting to "Allow all" immediately solved the problem! However, are there any se

2020-04-19 09:09:33 +0000 commented question What would cause a RST,ACK from client to SMB server?

I've tried Synology, Windows 10, Microsoft and Anandtech forums, so far nobody has an answer, hence I'm delving into Wir

2020-04-18 17:07:51 +0000 commented question What would cause a RST,ACK from client to SMB server?

@grahamb I'm not even accessing the shared folders, only the NAS at \hostname, so it shouldn't be an auth problem? @bubb

2020-04-18 15:24:43 +0000 commented question What would cause a RST,ACK from client to SMB server?

Hi, here's the link I notice from comparing a working and non working capture, that the working one has some NTLM inform

2020-04-18 15:19:57 +0000 commented question What would cause a RST,ACK from client to SMB server?

Hi, here's the link

2020-04-18 14:31:02 +0000 commented question What would cause a RST,ACK from client to SMB server?

Here it is in the original post. Let me know if you want to expand anything. Not sure what I should be looking at.

2020-04-18 14:28:46 +0000 edited question What would cause a RST,ACK from client to SMB server?

What would cause a RST,ACK from client to SMB server? Hi, I'm trying to troubleshoot a problem I have with a Windows PC

2020-04-18 14:26:57 +0000 edited answer What would cause a RST,ACK from client to SMB server?

Here it is. Let me know if you want to expand anything. Not sure what I should be looking at.

2020-04-18 13:59:13 +0000 received badge  Rapid Responder (source)
2020-04-18 13:59:13 +0000 answered a question What would cause a RST,ACK from client to SMB server?

How should I share the packet? In what format?

2020-04-18 07:31:40 +0000 received badge  Editor (source)
2020-04-18 07:31:40 +0000 edited question What would cause a RST,ACK from client to SMB server?

What would cause a RST,ACK from client to SMB server? Hi, I'm trying to troubleshoot a problem I have with a Windows PC

2020-04-18 07:29:22 +0000 asked a question What would cause a RST,ACK from client to SMB server?

What would cause a RST,ACK from client to SMB server? Hi, I'm trying to troubleshoot a problem I have with a Windows PC