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DeviceMaster RTS rebooting [message #1005] Mon, 23 July 2018 16:17 Go to next message
0806AM
Messages: 5
Registered: July 2018
Member
Is there a scheduled self test or maintenance as part of the default configuration of an RTS device? I have 3 brand new Comtrol RTS 8 ports that reboot themselves every Friday at the same time. I haven't seen any kind of config in either DeviceMaster or Portvision that has a scheduler. When I check the uptime every Monday, it reflects the same reboot times from the previous Friday. I've ruled out any power issues as they're on separate rackmount strips. I've even plugged an old digital clock with no battery backup into one of the strips to verify we weren't losing power.
Re: DeviceMaster RTS rebooting [message #1006 is a reply to message #1005] Mon, 23 July 2018 17:29 Go to previous messageGo to next message
Austin is currently offline  Austin
Messages: 9
Registered: March 2018
Location: Minnesota
Member
Hello,

Interesting. There is no scheduled self test or anything that occurs with any scheduled regularity like that; It has to be an outside source.

1) When you say you "check the uptime every Monday..." WHERE are you checking the uptime? Are you referring to the timer in our embedded page [ for the DeviceMaster, right on the "Home" page? ] Or is there a different source such as software on your PC?

There is conceivably two things that can be "cycled:" The driver (which is on a PC and can be disabled/re-enabled without rebooting the DM) and then of course the DeviceMaster itself can be cycled by:

Portvision DX

The DM's own embedded page

Cycling power

The driver could be cycled by various things. For example, the right (wrong) type of weekly security scan could be temporarily interfering with port 4606 and causing the driver to drop/reconnect.

Please let us know the answer to Question 1 and then we will reply in a more specific direction.

-Comtrol Support


Austin Wong-Parker | Technical Support
www.comtrol.com

Comtrol Corporation
100 5th Avenue NW
New Brighton, MN 55112

austin.wong-parker@comtrol.com
Main: 763-957-6000

[Updated on: Tue, 24 July 2018 10:01]

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Re: DeviceMaster RTS rebooting [message #1007 is a reply to message #1006] Mon, 23 July 2018 18:03 Go to previous messageGo to next message
0806AM
Messages: 5
Registered: July 2018
Member
I'm checking uptime via Portvision DX. From the properties of the device, then Web Interface tab (Home). The amount of time that System Uptime shows matches the amount of time that has passed since the system lost connectivity to it's com ports. Firmware is NS-Link 11.23 if that's relevant.
Re: DeviceMaster RTS rebooting [message #1008 is a reply to message #1007] Tue, 24 July 2018 09:59 Go to previous messageGo to next message
Austin is currently offline  Austin
Messages: 9
Registered: March 2018
Location: Minnesota
Member
Hi,

Thanks for the information. It appears you're checking on the Web Interface then. We suspect this is similar to a buffer overflow type; a Denial of Service, though we're unable to reproduce the symptoms here on our test labs. We have seen it when the SNMP port was scanned - your case may be different depending on external factors such as security scans / network updates / etc.

We suggest checking in with your network administrator to see if there's a script or schedule on the network that does security scans. Perhaps you can exclude or limit the scope of the scan for the DeviceMaster; putting it on an isolated network for a few days can allow you to see if it's the DM or network.

Let us know.

- Comtrol


Austin Wong-Parker | Technical Support
www.comtrol.com

Comtrol Corporation
100 5th Avenue NW
New Brighton, MN 55112

austin.wong-parker@comtrol.com
Main: 763-957-6000
Re: DeviceMaster RTS rebooting [message #1009 is a reply to message #1008] Sun, 29 July 2018 15:30 Go to previous messageGo to next message
0806AM
Messages: 5
Registered: July 2018
Member
It does appear this has to do with vulnerability scans. There is a scheduled scan taking place at the time of the reboots. It seems to happen even with SNMP disabled and only on our newer units. Our older units are scanned with the same job but they're running SocketServer 3.19 and don't reboot.
Re: DeviceMaster RTS rebooting [message #1010 is a reply to message #1005] Mon, 30 July 2018 06:55 Go to previous messageGo to next message
Kurt is currently offline  Kurt
Messages: 290
Registered: July 2016
Location: Minnesota
Power User
Hi,

Would you be able to email me the details of your test?
For instance, the name of the test software and the nature of the vulnerability testing being done.

I'd love to be able to reproduce it here and see what we can do to fix this issue.

If you can email the details to me at kurt.rees@comtrol.com I would definitely appreciate it.

Thanks,
Kurt


Kurt Rees
www.comtrol.com
http://forum.comtrol.com/

Comtrol Corporation
100 Fifth Ave NW
Minneapolis, MN. 55112
Direct +1 763.957.6000 | +1 Fax (763) 957-6001
connect. communicate. control
Re: DeviceMaster RTS rebooting [message #1011 is a reply to message #1010] Fri, 03 August 2018 19:41 Go to previous messageGo to next message
0806AM
Messages: 5
Registered: July 2018
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It's a pretty basic Nessus port scan. Would adjusting TCP keepalives higher or lower make the device less sensitive to a port scan?
Re: DeviceMaster RTS rebooting [message #1012 is a reply to message #1011] Mon, 06 August 2018 13:09 Go to previous message
Kurt is currently offline  Kurt
Messages: 290
Registered: July 2016
Location: Minnesota
Power User
Hi,

Thanks for the info. We'll get a trial copy of Nessus and will see if we can reproduce the issue here to see what is happening. I'll update you when I get more info.


Kurt Rees
www.comtrol.com
http://forum.comtrol.com/

Comtrol Corporation
100 Fifth Ave NW
Minneapolis, MN. 55112
Direct +1 763.957.6000 | +1 Fax (763) 957-6001
connect. communicate. control
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