Problem updating from Debian 1.5 to 1.7 9

[Chuge]

Good morning,
I am encountering a problem when I try to update the WAPT 1.5 community server installed on a Debian 9 system to version 1.7
I'm getting an error message regarding the GPG key

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 GPG error: https://wapt.tranquil.it/debian/wapt-1.7 stretch InRelease: The following signatures were invalid: EXPKEYSIG 58F751F8EE23241E Tranquil IT Systems <contact@tranquil.it>
W: The repository 'https://wapt.tranquil.it/debian/wapt-1.7 stretch InRelease' is not signed.

Do you have a solution?
Regards

[Chuge]

Using this command, I no longer get the error message

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 curl -k https://wapt.tranquil.it/debian/wapt-1.7/dists/stretch/InRelease | gpg --keyring /etc/apt/trusted.gpg --verify

the result of this command without the -k

curl https://wapt.tranquil.it/debian/wapt-1. ... /InRelease | gpg --keyring /etc/apt/trusted.gpg --verify
%
Total
%
%
Received https://curl.haxx.se/docs/sslcerts.html

curl performs SSL certificate verification by default, using a "bundle"
of Certificate Authority (CA) public keys (CA certs). If the default
bundle file isn't adequate, you can specify an alternate file
using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
the bundle, the certificate verification probably failed due to a
problem with the certificate (it might be expired, or the name might
not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
the -k (or --insecure) option.
gpg: verify signatures failed: Unknown system error

gpg: no valid OpenPGP data found.
gpg: the signature could not be verified.

Regards

[Chuge]

Upgrade to 1.7 -> OK

But there's still an error message:

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wget -O - https://wapt.tranquil.it/debian/tiswapt-pub.gpg  | apt-key add -
--2019-09-11 13:18:41--  https://wapt.tranquil.it/debian/tiswapt-pub.gpg
Resolving wapt.tranquil.it (wapt.tranquil.it)... 185.16.48.72
Connecting to wapt.tranquil.it (wapt.tranquil.it)|185.16.48.72|:443... connected.
ERROR: The certificate of ‘wapt.tranquil.it’ is not trusted.
ERROR: The certificate of ‘wapt.tranquil.it’ hasn't got a known issuer.
The certificate's owner does not match hostname ‘wapt.tranquil.it’
gpg: no valid OpenPGP data found.

[sfonteneau]

It was a temporary issue on our repo.
It should be working now!