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Malwarebytes is blocking my network printer that is configured on a TCP/IP port.  Printer is a Ricoh IM C4500

When I print, printer is shown as offline.  I exit Malwarebytes, it prints.

I just tried to narrow it down and I turned off in this order web protection, malware, ransomware, exploit.  Printer did not go back online until exploit (so all 4 was off).

I turned all back on right away and can print.

However, if I wait 5 minutes, same thing happens.  Printer is noted as off line and I need to exit malwarebytes to get it to print.

If I go into the printer port properties, and turn off SNMP, the the printer shows and remains online.

This is new and just recently happened.  I do not know if it was malwarebytes or a windows update.

Any ideas?

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This issue is likely resolved in the latest Malwarebytes Beta.  If you wish to give the beta a try please refer to this post for details about the beta and instructions on installing it, otherwise you

I do have version component package 1.0.1096. To be really sure, I uninstalled MWB with the uninstall tool and reinstalled. Same result as before.

Very sorry to hear you've encountered this issue. In general the latest update appears to work for most but not all users. We're continuing to work and analyze this issue so that we can resolve it for

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Thanks for posting in the Malwarebytes for Windows Help forum.

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Please see if the option for blocking penetration testing attacks is enabled under the Security tab in Malwarebytes' settings, and if it is, disable it:


That option should be off by default and is not for protection from actual threats; it's a setting used for pen testing, primarily in corporate environments.  If that does not resolve the issue, click the Advanced settings button under the Exploit Protection section then click the Restore Defaults button and see if the problem is now corrected.

Please let us know how it goes.



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Block penetration testing attached was off.

I just tried the restore defaults and looks like nothing changed.

I then re-enabled SNMP and printer is off line again.

I exited malwarebytes, enabled snmp and printer stays online.  So I do think it is related to malwayebytes. I am not sure if I need SNMP.  Not sure what it does for me.

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Thanks for the details.  Unless you're using SNMP to configure your printer, you probably don't need it enabled, especially if all you are doing is printing over the network.  Details on what SNMP is and how it works can be found here.

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4 minutes ago, DBlum said:

We have around 30 computers having the same issue, all running Windows 2004 and latest version of MBAM Premium

Please try following the instructions in this post and let us know if it makes any difference or not.


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I work for a Managed Service Provider and we have been experiencing this issue all day across multiple clients.


Exiting MalwareBytes or disabling SNMP on the printer port like neoman said makes the printer show up as online again. It is definitely related to Malwarebytes. Also, none of the clients had "Block Penetration testing attacks" turned on either.

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Thank you for verifying the issue.  We've also been seeing some issues recently with some of the defaults for the advanced settings for Exploit Protection not being honored, requiring the user to open Malwarebytes and access settings via the small gear icon in the upper right, navigate to the Security tab, click the Advanced settings button under the Exploit Protection section, then click on the Restore Defaults button (even if no settings have been modified by the user, and even if all defaults appear to be set already).  That said, the OP already tried that and indicates that the issue persisted after doing so, meaning one of the default settings/shields in Exploit Protections is causing the issue.

This problem has been reported to the team and is under investigation.  I will report your findings to them as well and hopefully we will see this issue resolved soon.


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This issue is likely resolved in the latest Malwarebytes Beta.  If you wish to give the beta a try please refer to this post for details about the beta and instructions on installing it, otherwise you may wait for the new version to be released once beta testing is completed with the release expected to be a week from now.

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We disabled snmp across the board as this isnt really relevant for our clients for now.  Please DM me if possible or post here when non-beta is released so we can get on client machines.  Thank you

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This issue is not fixed in the current beta but should be in the next beta. The release version will depend on whether or not the beta fixes the issue for all users. If so then it may be a couple of weeks after that, before it's released


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There is a simple fix to this issue for "most" folk.  If you go into the printer properties and then select the "port" it is using and then select "Configure Port" you can simply remove the tick from the box "SNMP Status Enabled".  This disables the SNMP heartbeat and Windows does not mark the printer as offline anymore.  I have done this and the issue is resolved. 

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You will no longer know if the printer is online or offline if you do this but at least if you know it's online then it will print okay without having to stop/start the spooler service. If you try to print (and it is really offline) the job will error in the queue and when the printer does go online again it will spit the print job out.  Not ideal but a whole lot better than the printer being marked as offline by Windows because it can't communicate the SNMP due to Malwarebytes breaking the communication.


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I had this issue and my printer Epson SX438W I have (many moons ago and using EpsonNet Config to disable the features on the printer itsself) disabled:    Bonjour, SLP and WS-Discovery.  I did this years ago because I did not want my printer to get "autodiscovered" by people when they joined my network.   As it is broken on mine (until I did what I said above) then it must be a failure in one of the other protocols causing the issue. Maybe if you have WS-Discovery enabled (which it would be in the majority of home use cases) then perhaps Windows uses this in preference to SNMP. If it is not working or not present then maybe Windows falls back to SNMP and this is where the problem lays.   Only guessing here. 

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Hello there,

i have hundreds of MBAM-Licenses  installed at several Customers.

This Monday, October 19th, i installed MBAM on 7 new Clients.

All 7 Clients use the same Printer, Brother MFC-7460 via direct IP-Port. I can confirm, that 3 of 7 Clients had the "offline issue" beginning October 20th in the morning!

Today, i read this threat and after that disabled SNMP on all Clients. It seems that this Workaround is successful, Printer is online on all Clients.

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1 hour ago, Softheads said:

Same issues: Win 10 pro, HP 8600 printers.

WORKAROUND FIX: disable MWB Web Protection - printers instantly come back on line.

MWB: please fix this.

You should be able to disable SNMP for your printers to keep Web Protection enabled while still being able to use your printers as a workaround until the issue is fixed.

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Spoke to soon - after overnight shutdown it's back to not seeing the Buffalo LinkStation drive. When I first posted, nothing on my system was changed other that Windows Defender and MBAM Updates.

Currently running  Update package 1.0.31924  Component package ver. 1.0.1070

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