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Are the mappings requiring SMBv1? And was SMBv1 disabled or removed?
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Step1:<br />
check networking <br />
ping xxx.xxx.xxx.xxx<br />
If necessary do an extended and leave for a minute<br />
ping xxx.xxx.xxx.xxx -t<br />
<br />
Step2:<br />
Review Firewall.<br />
If windows firewall is open, check if you have any other software in the box that can control the firewall.<br />
<br />
Step3<br />
Physical NIC.<br />
Use ping 127.0.0.1<br />
if it answers the nic is good, if it doesn't physically the NIC is bad and the hardware needs to be replaced.<br />
<br />
<br />
Step4:<br />
Permissions.<br />
Make sure that in the shares, in both tabs (Security and Share) the users have the adequate permissions access. In windows, a denial permission gets over any granting permissions.
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No connection or permission issue. Even folder permission with everyone. <br />
<br />
I need to find why clients reset connection after NTLM auth was completed from servers to the client. This happens to all servers. <br />
I also checked if recently there was windows updates, no history of updates also. <br />
Researching on the SMB event IDs, I can't find many but most of solutions are focused on client sides...
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Wireshark shows SMB 2 negotiation success. <br />
On client sides SMB1 is disabled.
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Are you using legacy mappings that require SMBv1?
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what is legacy mapping? I use UNC path format \\server\share
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Did you do all the steps I provided? I'm not clear on your answer sorry.
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I already did the 4 steps you mentioned before I post here, spent two days
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Turn off the firewall completely, do the test if anyone can access if it can, there's a problem with your firewall, if not you should consider changing the nic or adding a new one to test.
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Firewall is off. same issue. <br />
using a different lan to usb adapter, same issue
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Does anyone know about the following SMB events? I don't find many resources regarding such;<br />
<br />
30803<br />
30804<br />
30805<br />
30807
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didn't get the best answer.
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<div class="content wysiwyg-content">
It started happening some time ago. it doesn't seem there's a pattern. <br />
First, SMB ports are all open in firewall, 137,138,139,445. Wireshark shows client connects then RST (reset) connection. <br />
Network team repeatedly confirmed that there was no change no error no deny log, everything is fine. <br />
<br />
I virtually followed all solutions online for two days modifying registry, doesn't work. When client connects to share folders by \\xxx.xxx.xxx.xxx\share1, it throws 0x80004005 and windows events related to SMB:<br />
30803<br />
30804<br />
30805<br />
30807<br />
<br />
Any comment, will be appreciated
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It started happening some time ago. it doesn't seem there's a pattern. 
First, SMB ports are all open in firewall, 137,138,139,445. Wireshark shows client connects then RST (reset) connection. 
Network team repeatedly confirmed that there was no change no error no deny log, everything is fine. 

I virtually followed all solutions online for two days modifying registry, doesn't work. When client connects to share folders by \\xxx.xxx.xxx.xxx\share1, it throws 0x80004005 and windows events related to SMB:
30803
30804
30805
30807

Any comment, will be appreciated

Some client can't access SMB share folders

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.

Windows OS

The Windows operating systems have distinct methodologies for designing and implementing networks, and have specific systems to accomplish various networking processes, such as Exchange for email, Sharepoint for shared files and programs, and IIS for delivery of web pages. Microsoft also produces server technologies for networked database use, security and virtualization.