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I have upgraded the firmware with the latest version and I also install the SNMP as I was using before for monitoring the router. However, after the upgrade, the OID has changed and I was only able to read the values after I upgrade the MIB file as in here:  https://wiki.teltonika-networks.com/wikibase/index.php?title=RUT955_SNMP&mobileaction=toggle_view_desktop. But the problem I have now is the WAN access to the SNMP, I am only able to read values in the local network but not using the public IP.

I check the firewall and it seems it is correctly configured and should allow for access in WAN to SNMP port 161 but this is not happening.

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Hello,

Have you checked your mobile interface configuration after the update? Do you still have public IP? Can you access your router remotely via public IP (for example, remote HTTP)?

Regards.
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Yes!

I have the public IP and I have access to all services I had before. The only issue I have is with SNMP on the public interface. I got a timeout each time I try to read an SNMP value, but when read in local IP I got correctly the values.
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That is very unusual. I have tested SNMP service myself and it worked through public IP. May I ask if you could re-install SNMP package?
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I delete the old installation of SNMP and did a fresh installation of the SNMP package using Package Manager and now I see the SNMP is installed but it does not show up in services anymore.

Ok! I got it... I did not change to advanced management so could not see the snmp service. I enable the SNMP and remote access but was still not able to get it working in public IP
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Could you send a troubleshoot file to me via private message to investigate?
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yes! we can have also a show meet if possible and can show you live what is happening
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Yes, we could arrange a remote session. Please send me your AnyDesk ID via private message and I will log in.