Do not see computers connected to the network -- SG200-26 26-Port Gigabit Smart Switch

[muki30001]

Hope this is the right forum for the question

I got a new switch
And connected it to my router (home network)
I do not see the computers that are connected to the network

Each computer has Internet access but it is not possible to access shared folders

Something I could do with the old 100 MB switch

I thought that in default settings mode it would work
Do i need to define VLAN Or something else

[muki30001]

Can you upload here the latest firmware that matches my switch?

[Georg Pauwen]

Hello,

use Nmap to scan for open ports (TCP ports 139 and 445, and UDP ports 137 and 138). I have a feeling the problem is at a lower level. The SG200 is a fairly dumb, layer 2 only switch which I think doesn't even have a CLI. Nmap will at least show you if the ports on your target(s) are open and reachable...

Below is the download link for the self installer:

https://nmap.org/download.html

[paul driver]

Hello

@Georg Pauwen 
My understanding its either the pcs not having netbios/tcp or file -print sharing enabled which has been confirmed they do have from the recent ipconfig/netstat readouts or the switch is negating netbios

@muki30001

can you perform one more test please via ip address of a sharing pc and see if  connects but reboot your computers first ? 

start/run
\\x.x.x.x ip of pc\share name

example
\\10.10.10.1\d$

[muki30001]

@Georg Pauwen 

Result All ports are open

@paul driver

I did what you wrote
I receive a message that I do not have permission
And contact your network administrator

[paul driver]

Hello

---

@muki30001 wrote:

 @paul driver

I did what you wrote
I receive a message that I do not have permission
And contact your network administrator 

---

Open cmd prompt in admin mode and try again 

are you asli able to access the switxh via cli to apply the udp forwarding as I suggested 

[Georg Pauwen]

Hello,

try and disable SYN Protection (page 205 of the attached guide):

Security --> Denial of Service Prevention --> SYN Protection

https://www.cisco.com/c/dam/en/us/td/docs/switches/lan/csbss/sf20x_sg20x/administration_guide/Cisco_200Sx_v1_4_AG.pdf

[Georg Pauwen]

Hello,

I have looked around and found the bug below (including numerous discussions about users having the same problem). Although this has been diagnosed with older firmware, and you would think it has been fixed in newer firmware releases, I think it is still somehow related to the fact that the SG200 filters (certain) layer 3 packets.

Can you check the 'System Operational Mode' on the 'System Summary' page ?

Can't use network printing via MAC IOS or use NFS on Windows Machines
CSCuh23634
Description
Symptom:
Problems connecting through SG200.

FTP and printing large documents fail.

Conditions:
PC connected through SG200.

Workaround:
None.

[muki30001]

Can you check the 'System Operational Mode' on the 'System Summary' page ?

i dont have this option in the switch

Can you upload here the latest firmware that matches my switch?

[Georg Pauwen]

Hello,

here is the lowest available software version that existed prior to the bug. Check if that one works...

[muki30001]

I'll try it today

But if that does not work How do I return this to the current version ?

With hard reset ?

[Georg Pauwen]

Hello,

if this doesn't work, reset to factory defaults and reinstall the latest firmware (I have attached the latest release just in case)...

[muki30001]

i get an error

Illegal software format

i unzip it first and then use the file Sx200_FW_1.0.0.19.ros

is it ok

or i need to use as zip file ?

[Georg Pauwen]

Hello,

you need to use the unzipped file in .ros format. Sometimes you need to install a lower version first and then downgrade.Try another version (attached) first:

[muki30001]

I managed to download a version to a file sx200_fw-13059.ros

this file Sx200_FW_1.0.0.19.ros give me error again (same As before)

[Georg Pauwen]

Hello,

try and install the version attached, 1.3.7.18, and once that is installed, try the 1.0.0.19 version.