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I was checking my auth.log file when I saw multiple lines like this one : Jul 30 22:34:08 <server-name> agetty[31666]: /dev/ttyS1: not a tty

Those lines are logged 4 times every 10 seconds, and it just doesn't stop.

I have a server running with Linux Debian9

Rui F Ribeiro
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clafoutis
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2 Answers2

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The most likely cause on Debian 9 is that you have a console=ttyS1 setting on your kernel command line, which systemd-getty-generator is picking up, causing it to instantiate a serial-getty@ttyS1 service. This service runs Weitse Venema's agetty against the ttyS1 device. But you do not actually have a /dev/ttyS1 terminal character device on your server. The file (apparently) exists, but it is not a terminal character device file.

Further reading

JdeBP
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Try

systemctl stop getty@ttyS1
systemctl disable getty@ttyS1
vladlu
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