Are you sure it's not capacitor plague? Easy to fix with a smd rework
station

On Oct 17, 2016 12:55 PM, "Scott Lambert via Mikrotik-users" <
mikrotik-users@wispa.org> wrote:

> We deployed a lot of RB493Gs a few years back.  They are starting show
> 80 to 95% bad blocks on their flash storage.  I've been losing two to
> three per month for a few months now.
>
> The initial symptom is the automated ssh process which gathers IP pool
> utilization to feed MRTG starts reporting that it cannot log in.  When I
> go to look at the problem, all users are gone and I can only log in as
> admin with no password.  They do not survive a reboot.  But so far, if I
> don't reboot them, they keep doing what they were supposed to do.  They
> just allow anyone to login with the default username and password.
>
> So far, I've not lost any RB450Gs, but beings from the same family, I
> half expect them to start going.  I have many fewer of those.
>
> I'm not upset about losing these things after 3 to 5 years. I am curious
> if others are seeing the same thing happen on your networks.
>
> If others have left their RB493Gs on older firmware and are not seeing
> issues, maybe it's a 6.30+ issue on RB493G bug?  Most of my have been
> brought up to 6.30+ to work around some PPPoE + mangle/queue tree
> issues.  (The MSS mangle rules don't get inserted before rule 0 leading
> to PathMTU issues.)
>
> If it is happening to others, maybe I need to order 16 to 21
> replacements and do some preventative swaps.
>
> "RouterOS RB493G","6.34.6"
> "RouterOS RB493G","6.32.3"
> "RouterOS RB493G","6.34.4"
> "RouterOS RB493G","6.7"
> "RouterOS RB493G","6.32.3"
> "RouterOS RB493G","6.34.6"
> "RouterOS RB493G","6.34.6"
> "RouterOS RB493G","6.30.4"
> "RouterOS RB493G","6.34.4"
> "RouterOS RB493G","6.30.4"
> "RouterOS RB493G","6.32.3"
> "RouterOS RB493G","6.18"
> "RouterOS RB493G","6.18"
> "RouterOS RB493G","6.7"
> "RouterOS RB493G","6.18"
> "RouterOS RB493G","6.30.4"
>
> "RouterOS RB450G","6.7"
> "RouterOS RB450G","6.32.3"
> "RouterOS RB450G","6.32.3"
> "RouterOS RB450G","6.34.6"
> "RouterOS RB450G","6.34.6"
> "RouterOS RB450G","6.27"
> "RouterOS RB450G","6.34.3"
>
> --
> Scott Lambert                    KC5MLE                       Unix SysAdmin
> lamb...@lambertfam.org
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> Mikrotik-users@wispa.org
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>
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