BUG REPORT: check_connections on German Windows locale reports "unhandled tcp state: HERGESTELLT" and returns 0 for state counters

[AlexanderJunghans]

Describe the bug

On a German Windows Server 2022 21H2 in german, check_connections appears to fail to map localized TCP state names correctly.

The log contains this errors like:

[2026-04-08 13:56:17.441][Error][pid:1096][check_connections_windows:73] unhandled tcp state: HERGESTELLT

HERGESTELLT is the German localized state name for ESTABLISHED.

check_connections exposes perfdata for the documented state counters but the following counters are always returned 0, even though matching connections exist:
established, syn_sent, syn_recv,fin_wait1,fin_wait2,time_wait,close,close_wait,last_ack,listen,closing and new_syn_recv.

total gives valid perfdata.

To Reproduce
Install snclient v0.42 on Windows Server 2022 21H2 x86_64 language Settings German.

check_nsc_web -C certs/nagios.pem -K certs/nagios.key -ca certs/ca.pem -tlsmin tls1.3 -p "xxxxxx" -u "https://192.168.x.x:8443" check_connections

OK - total connections: 731 |'total'=731;1000;2000;0; 'established'=0;;;0; 'syn_sent'=0;;;0; 'syn_recv'=0;;;0; 'fin_wait1'=0;;;0; 'fin_wait2'=0;;;0; 'time_wait'=0;;;0; 'close'=0;;;0; 'close_wait'=0;;;0; 'last_ack'=0;;;0; 'listen'=0;;;0; 'closing'=0;;;0; 'new_syn_recv'=0;;;0;

In the log of the snclient i see errors like:

[2026-04-08 13:56:17.441][Error][pid:1096][check_connections_windows:73] unhandled tcp state: HERGESTELLT
[2026-04-08 13:56:17.441][Error][pid:1096][check_connections_windows:73] unhandled tcp state: WARTEND
[2026-04-08 13:56:17.473][Error][pid:1096][check_connections_windows:73] unhandled tcp state: ABH™REN

with german lables.

Expected behavior
check_connections should normalize localized Windows TCP state names to the internal SNClient state names
the state counters above should contain the real values instead of always being 0
localized Windows installations should behave the same as English Windows installations

What I suspect:
It looks like the Windows implementation expects English TCP state names and does not translate localized names such as HERGESTELLT -> ESTABLISHED.

Software (please complete the following information):

• SNClient version: v0.42
• OS: Windows Server 2022 / Windows with German locale
• Check: check_connections from linux (Debian 13)