[PLUG] No Incoming Mail: Postfix-2.11.3 [RESOLVED]

[John Bartley K7AAY john@503bartley.com]

>
>
> Rich Shepard <rshepard at appl-ecosys.com> wrote on Thu, 8 Jan 15:03:56
> -0800 (PST)
>
> On Thu, 8 Jan 2015, Keith Lofstrom wrote:
>
> > Glad you are back ... I think ... fully appreciating Rich Shepard
> requires
> > peculiar tastes :-)
>
> Keith,
>
>    Nice to know _someone_ appreciates me. :-)
>
> > Your firewall/router and modem/switch probably have optional settings
> that
> > can block incoming ports (which you probably do not use). My further
> guess
> > is that these settings are stored in EPROM, and expanded into live code
> in
> > faster RAM at device boot time. The code in RAM can be upset by static
> > electricity, cosmic rays, evil gremlins, and probable for this time of
> > year, power glitches.
>
>    Ah, so.
>
>
Also, excess RF, which can also temporarily derange the settings in
consumer networking gear.


> > A deep power cycle ( more than 10 seconds should be plenty ) will restore
> > the modem/router to status quo ante; a quick off/on may not clear the RAM
> > or trigger a full reset.
>
>    I always power cycle deeply. When the capacitors finish draining (the
> electron pool on the desktop stops growing) and I know it's time to turn it
> back on.
>
>
An EE who worked for ITT told me once it takes at least eight secs for
electrolytic caps to discharge after a powerdown, and powerup before that
eight second interval results in early failure. Therefore, when I ask folks
to do power cycles on PCs, I always ask them to wait at least eight seconds.

However, sometimes, a longer delay is called for in resetting cable and DSL
modems. Experience indicates a two minute power cycle allows the ISP to
issue a new DHCP lease, and that also often solved problems with the
consumer gear I was supporting.

--
73s/Best regards de John Bartley K7AAY  CN85qj   •|||||||•
 "By reading this message, you agree to the NSA terms of service."