That's a problem in the testing program, when it tries aliasses of the same node at the same time.
When I test it separately, it's OK:
Nodelist for Monday, February 19, 2024 -- Day number 050 parsed, 963 IP-nodes processed (0.014 sec)
Calling '4:80/1'. Call time: '0000-2400' UTC.
Now is: 1756 UTC.
fido.rbt.net.br, 24554
Calling 4:80/1 (35.192.92.175:24554)
OPT CRAM-MD5-136601be320d8a5463b5d2f688cf110f
SYS Internet Hub
LOC Rio de Janeiro - Brazil
ZYZ Flavio Bessa
TIME Mon, 19 Feb 2024 14:56:41 -0300
VER Mystic/1.12A47 binkp/1.0
BUILD 2021/12/24 21:21:16 Linux/64
address: 4:80/1@fidonet
address: 4:801/0@fidonet
address: 4:80/0@fidonet
address: 4:801/1@fidonet
35.192.92.175 - Ok.
QSIZE 0 files 0 bytes
Session with 4:80/1 done.
Bye, Wilfred.
--- FMail-lnx64 2.2.1.1
* Origin: FMail development HQ (2:280/464)