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Following on the from the resolved local NAS issue, I have another that sounds very similar. It has not come to light sooner because I do very little printing right now. I use a network attached printer on the same network as my NAS. It seems that following a system restart, Windows will not send data to the printer (which remains visible in the print job queue) until I disable, you guessed it, our old pal Web Protection.

This is so very similar to the inaccessible NAS mystery that it simply has to be related. Could someone please go through the appropriate code and see what's going on. Despite the discussion we had earlier on the subject, I am concerned that traffic which begins and ends on my own local network is being blocked. FWIW my printers are configured to use port 9100, presumably using the AppSocket protocol.

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Greetings,

An issue with network printers (specifically, the SNMP protocol) is already known and I believe was addressed in one of the recent releases.

Please see if the following corrects the issue:

  1. Download and run the Malwarebytes Support Tool
  2. Accept the EULA and click Advanced tab on the left (not Start Repair)
  3. Click the Clean button, and allow it to restart your system and then reinstall Malwarebytes, either by allowing the tool to do so when it offers to on restart, or by downloading and installing the latest version from here

Please let us know if this corrects the issue or not.

Thanks

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59 minutes ago, exile360 said:

An issue with network printers (specifically, the SNMP protocol) is already known and I believe was addressed in one of the recent releases.

Yep, the same printing problem was solved for me then, together with the network problem.

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OK – your message gave me a hint of something to try; sundry protocols were disabled on the printer (SSDP, IPSec, which have been disabled for six or seven years although SNMP has been enabled all along) and re-enabling them has, so far, cleared the issue. Does this make sense? Is the print communication now defaulting to a more secure state with which MB web protection is happier?

I have been using this configuration on the printer unchanged for quite a time (see above) and clearly, something has changed fairy recently but because I seldom print to paper these days, I cannot really say with any accuracy when this issue first arose.

Let's see how it goes for a while; I'm sure others will report their experience in this respect.

Thanks.

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Good, I'm glad you were able to get it working.  It may well be that enabling the other protocols helped; I'm not certain, however it might also be that doing so simply forced a refresh of the driver/filter and got the fix in Malwarebytes to 'kick in' so to speak.

If you do encounter any further trouble, I'd recommend trying a clean install of Malwarebytes, then enabling beta updates and installing the beta again, then restarting the system to make sure the latest components are loaded into memory, then test again to see if the issue remains or not.  It may also be necessary to try restoring defaults for the Advanced settings in Exploit Protection as this could also be due to a known issue where Malwarebytes fails to honor the defaults for that component initially.  Based on what I have seen, these networking issues appear to be related to both Web Protection and Exploit Protection which is why I suspect Exploit Protection may also be a factor here.

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OK – I'm afraid this one is still running, and it seems to be along entirely the same lines as the earlier NAS issue. I have done a clean reinstall as asked earlier and can add the following, which is critical to you being able to reproduce the problem. I have two network printers, an old HP LaserJet and a Xerox Phaser 7500, each having a stable IP address on the LAN.

With Web Protection disabled, all is well. When Web Protection is re-enabled, after about 8 minutes the printers appear to go offline – they "grey out" in the "devices and printers" window. Before the point at which they go offline, they remain useable but printing something does not seem to reset any counters – the printers become unavailable when the original 8 minutes (approx.) expires.

But let's get back to the crux of the matter – disable Web Protection and all the printers become available within a few seconds.

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