New firmware 1.18RC1

adavidm

No I didn't have any sessions open. That's not to say that someone else on the network wasn't trying to gain access though…
For the time being, I've just disabled Telnet in the config and I'll see how it goes.

If this is a corporate network there could be all sorts of port scanners, vulnerability assessment tools or even, unfortunately, compromised machines looking to spread a virus or malware. These may well see the Duet as an 'interesting' target as telnet is a legacy protocol that used to be in use by network infrastructure vendors a great deal. There a huge lists of default passwords and usernames out there that these programs use to brute force the telnet connection and take over such devices. One example of such a list:

http://www.defaultpassword.com/

If this is a smaller office or home network then the malware/virus case is more likely. It might be possible to identify the source traffic, either by binary search (Switch half of the machines off, if the problem recurs, switch half of the remainder off, etc). Alternatively, you could use a tool like Wireshark to look for the offending node but this is more complex with WiFi in the mix.

Hope this helps.

David

edit - clarity

dc42

This is why I added the facility to support http but not telnet or ftp, with telnet and ftp turned off by default. But it doesn't explain why earlier versions of firmware worki for ChrisP.

ChrisP

I'm on a university network, so I'm pretty certain that there's at least one machine that will have been hacked and is scanning all the ports. To be honest, I probably should have figured out the problem sooner as it's not the first time it's happened.

As for it working with other firmware, I wonder whether it was just an unfortunate coincidence. When I had the problem back on Wednesday, I had tried older firmware versions and had those fail too - that's what initially made me wonder whether it was a hardware problem.

Anyway, having turned off Telnet (which I didn't use anyway), all is fine again… hopefully

DjDemonD

Hi David, I know previously we discussed using G30 to reset the z height after grid levelling/calibration and you mentioned doing this on a grid point. I just installed this firmware and after calibration I did a G30. I noticed the nozzle change x,y position fractionally before the G30 executed, does the firmware auto position on a grid point for this in this version?

dc42

No it doesn't, but in this version bed compensation and orthogonal axis compensation are disabled during homing moves.

dc42

I've just released firmware 1.18RC2. I am particularly keen for Duet 0.6/0.8.5 users to test it, to see if it resolves the network issues that some users had with beta3 and RC1.

dc42

ChrisP, thanks for your patience. Please can you try the Duet06/085 firmware at https://dl.dropboxusercontent.com/u/19369680/RepRapFirmware.bin and let me know if you have stability problems with it. If you find that you are unable to connect via HTTP at all, then please run M122 from USB and report the Network section of the diagnostic report.

ChrisP

No problem.
I updated a couple of Duet 06 boards at work to 1.18RC2 and disabled Telnet and haven't had any stability problems since. Unusually, I haven't actually used those printers in the past day or so, but they have been left on 24/7 and I haven't had any problems connecting via HTTP. I'll try the FW in your link anyway, in particular with my old Duet 06 at home that I never managed to get to work on anything beyond 1.17e.

dc42

ChrisP, I think I found the problem. Does your home network have a zero in the IP addresses it uses?

ChrisP

Yes it does. 192.168.0.x

dc42

Thanks for confirming that. The problem is fixed in the 1.18 release.