[MCARC] LotW

[Myron Nolind]

I believe it uses the TPM module signature as part of the authentication.
So new computer new key needed. Welcome to enhanced security.

On Thu, Feb 5, 2026 at 10:41 AM David Crawford <dcrawford2020 at gmail.com>
wrote:

> Mike,
>
> A certificate is “tied” to a specific computer. Your old one probably
> expired.
>
> Dave
>
> Sent from my iPhone
>
> On Feb 5, 2026, at 10:28 AM, Michael Philbrick <philbrick52 at gmail.com>
> wrote:
>
> 
>
> Good morning fellow hams,
>
> Information only for those with a Logbook of the World account with ARRL.
> The story is I had setup a LotW account with ARRL. At some point in time, I
> replaced a computer with a newer model of an old computer. I have never
> really been interested too much in special things that a ham can
> investigate and/or participate in, but the Worked All States (WAS) for the
> 250th did get my attention. That ham activity requires using LotW. So, I
> began trying to setup that app on my present ham computer. I have my
> original postcard from ARRL and I found my 3+ years old email with my
> trusted certificate file. I could eventually login and see my QSO/QSL
> history, my certificate number, and my certificate dates. However, many
> features are grayed out. I cannot upload my tq6 special file and the reason
> popup states it is because "this is not the computer you requested your
> certificate". I suppose it is a MAC addressing issue. That's the only way
> that makes any sense to me that ARRL could be filtering access. There are
> several YouTubes on setting up your LotW account. I didn't find one on what
> happens if your computer crashed or if you upgraded to a different
> computer. Yes, a little perturbed, but now awaiting an email with new
> certificate.
>
> --
> *Michael Philbrick*
> Odd Job Technician
> Retired Guys LLC (fictional)
> *Cousin to my genealogy relativesNØUDF to hams*
>
> *Retired science/CTE educator*
> Seneca, KS
> mdp.seneca at gmail.com
> https://www.facebook.com/michael.philbrick/
> 785-294-2719
>
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