cannot connect to sieveshell anymore

Hello together,

after succesfully having changed my cyrus imap to tls/ssl some time ago=20
I had to change one entry of my sieve script.
However, I am not able to authenticate any more after executing
sieveshell -u <user> -a <authname> localhost.
timesievesd is running as default on localhost:4190 only.

/var/log/mail.err:
badlogin: localhost [::1] NTLM authentication failure
badlogin: localhost [::1] PLAIN authentication failure
Lost connection to client -- exiting

my imapd.conf is:

configdirectory: /var/lib/cyrus
proc_path: /run/cyrus/proc
mboxname_lockpath: /run/cyrus/lock
defaultpartition: default
partition-default: /var/spool/cyrus/mail
partition-news: /var/spool/cyrus/news
newsspool: /var/spool/news
altnamespace: no
unixhierarchysep: no
lmtp_downcase_rcpt: yes
admins: cyrus
lmtp_admins: postman
sieve_admins: cyrus
allowanonymouslogin: no
popminpoll: 1
autocreate_quota: 0
umask: 077
sieveusehomedir: false
sievedir: /var/spool/sieve
httpmodules: caldav carddav
caldav_allowscheduling: on
caldav_create_default: 1
caldav_create_attach: 1
caldav_create_sched: 1
calendarprefix: #calendars
caldav_allowcalendaradmin: 1
hashimapspool: true
allowplaintext: yes
sasl_mech_list: PLAIN NTLM
virtdomains: userid
defaultdomain: my.domain
sasl_pwcheck_method: auxprop
sasl_auxprop_plugin: sasldb
sasl_auto_transition: yes
tls_server_cert: /etc/ssl/certs/ssl-cert-snakeoil.pem
tls_server_key: /etc/ssl/private/ssl-cert-snakeoil.key
tls_client_ca_dir: /etc/ssl/certs
tls_session_timeout: 1440
lmtpsocket: /run/cyrus/socket/lmtp
idlesocket: /run/cyrus/socket/idle
notifysocket: /run/cyrus/socket/notify
syslog_prefix: cyrus

I am running version 3.6.1 on Debian GNU/Linux 12 (bookworm)

Thnks for help in advance



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