Yes, you current certificate will not be impacted. (they will not "disabled" certificate already created using that method)
It will only impact renewals: if you try to renew that certificate, using the TLS-SNI-01 challenge during that week, it will fail.
If you are using certbot, you can follow these instructions to ensure that your renewal will work: How to stop using TLS-SNI-01 with Certbot
That is exactly the procedure (for Debain Jessie) that I followed and arrived to the point where the Apache server would not start any more.
We spent a night together with Rudy Gomes (God bless him) to revert to the old method.
I just hope that, as you are saying, my
Could you transmit my request to them (Let’s Encrypt) to consider a softer mean to alert people of the need of migration that interrupting the service ?
Thanks and kind regards
You do realise most of the people here are just volunteers? With different sets of skills, difference in knowledge. Although everyone here tries their best, perhaps the "active support" you've gotten just wasn't up for the problem you have.
Hi Osiris,
I am really grateful to all people of your team who dedicated their rime trying to assist me. I do not know if they are volunteers or not and I am not in the position to say if it was the right person for my problem.
I installed easily your “old” certificate which worked fine for my needs with TLS-SNI. My server configuration has not change, in any case not untill I tried to migrate. I am not a SSL specialist so I just followed the indicated procedure and it failed.
The situation is that the migration could not be achieved and I am put under the pressure by the threat of Febraury 13 dead-line.
I am disposed (with pleasure) to pay for a commercial support from you, provided that this migration can be succesfully achieved.
Kind regards.
Hi @UbikMZ! I want to emphasize what Osiris has said - there are a lot of people here working hard on their spare time to give you help for free. For my part, I do apologize for the late notice you receive about TLS-SNI deprecation. And as tdelmas said, you’ve actually got a lot longer than you think - you’ve got 90 days from the issuance of your last certificate, whenever that was.
It sounds like you have particularly in-depth needs for support, so you might benefit from paying a commercial CA for a certificate and using their paid support.
Just to be clear: The TLS problem has been on-going for over one year.
See: March 13, 2019: End-of-Life for All TLS-SNI-01 Validation Support
Hi @jsha
Thanks for your message.
I have already expressed my thanks to your team for their time and efforts.
I don’t think the configuration of my server is that complicated and my knowledge of it so low to require in depth help just to upgrade.
However I’ll be glad to pay for it just to stop the nightmare I have been living for a couple of days and nights.
Would you be so kind to provide the way to join this support ?
Kind regards.
Sure, if you Google “ssl certificate,” you’ll find a number of paid options. You should click around to find one that offers a support package you like for a reasonable price.
Thanks,
Jacob
Hi Jacob
I was wondering if I could stay with you paying for the support.
Concerning other CA providers I already started research to find an alternative.
Kind regards
You could always donate, but that wouldn't make any difference in the amount of support you'd get. This volunteer based community service is all there really is.
Hi Rudy
Welcome back:grinning:
Even though this problem is going for a year I got informed about it just a couple of days ago.
Thanks again for your help the other night. It helped me to avoid a disaster.
Cheers
Your very welcome.
Although I haven’t been able to resolve why the http challenges don’t work…
We did manage to get you 90 days to resolve this problem.
I’m sure someone here can figure this out long before that time comes.
You need not worry (so much) about this.
Cheers!
Sure.
You did the best possible job it was possible to do in the mess in which I have landed.
In the night of 12 - 13 I’ll be flying to Patagonia.
If my system doesn’t work as from February 13, I’m jobless when I’m back.
Not easy to be relax in that configuration.
Understandable isn’t it ? 
I think you have misunderstood what is expected to happen on/after Feb 13.
Nothing is expected to happen that will stop your cert from working until its’ expiration date:
which is May 2.
So we have until then to figure out how to get the automation process working with HTTP-01.
Thanks - I’ve received very good communication about this from you and it’s been easy to change the verification method to the new one.
Good info,
Can it be that by me
[renewalparams]
authenticator = webroot
installer = apache
account = aaXXXXXXXXXXXXXX
[[webroot_map]]
ecoviewater.com = /var/www/ecoviewater/public_html
www.ecoviewater.com = /var/www/ecoviewater/public_html
webroot_map section does not exist ?
Is this section mandatory ?
It gets created automatically when --webroot is used (successfully) to get a cert / renew a cert.
yes, i’m sure you helped out 
Great community - thanks once again.
have you enabled fail2ban or anything else which might block Amazon IPs?
I did that, and then HTTP-01 renewal stopped working because several of the LetsEncrypt servers are hosted on Amazon.
Took a while to diagnose…