sieveshell and sivtest is not working here :-(

[JOYDEEP]

Dear list,

in my system sieve is not working. I check the user cyrus by imtest.
 the command is "imtest -a cyrus -u cyrus  localhost -s"
 -----------------------------------------------------------
 TLS connection established: TLSv1 with cipher AES256-SHA (256/256 bits)
S: * OK lvps87-230-8-228.dedicated.hosteurope.de Cyrus IMAP4 v2.2.12
server ready
C: C01 CAPABILITY
S: * CAPABILITY IMAP4 IMAP4rev1 ACL QUOTA LITERAL+ MAILBOX-REFERRALS
 NAMESPACE UIDPLUS ID NO_ATOMIC_RENAME UNSELECT CHILDREN MULTIAPPEND
 BINARY SORT THREAD=ORDEREDSUBJECT THREAD=REFERENCES ANNOTATEMORE IDLE
 AUTH=PLAIN AUTH=LOGIN SASL-IR X-NETSCAPE
 S: C01 OK Completed
 Please enter your password:
 C: A01 AUTHENTICATE PLAIN Y3lydXMAY3lydXMAbWFoYWRldg==
 S: A01 OK Success (tls protection)
 Authenticated.
 Security strength factor: 256
-------------------------------------------------------------------

 now  " sivtest -a cyrus localhost" reports
 ----------------------------------------------------
 S: "IMPLEMENTATION" "Cyrus timsieved v2.2.12"
 S: "SASL" "PLAIN LOGIN"
 S: "SIEVE" "fileinto reject envelope vacation imapflags notify
 subaddress relational comparator-i;ascii-numeric regex"
 S: "STARTTLS"
 S: OK
 Please enter your password:
 C: AUTHENTICATE "PLAIN" {20+}
 AGN5cnVzAG1haGFkZXY=
 S: NO "Authentication Error"
 Authentication failed. generic failure
 Security strength factor: 0
 ------------------------------------------------------

 where may be the problem here ?
   

Even "sieveshell localhost " is not working too.

see below
------------------------
lvps87-230-8-228:~ # sieveshell localhost

connecting to localhost
Please enter your password:
unable to connect to server at /usr/bin/sieveshell line 169, <STDIN> line 1.
---------------------------------------------------

here is the log
--------------------------------
Apr 19 09:15:23 lvps87-230-8-228 sieve[3675]: attempting server step
after doneflag
Apr 19 09:15:23 lvps87-230-8-228 sieve[3675]: badlogin:
lvps87-230-8-228.dedicated.hosteurope.de[127.0.0.1] LOGIN generic failure
Apr 19 09:15:23 lvps87-230-8-228 perl: No worthy mechs found
Apr 19 09:15:23 lvps87-230-8-228 master[31987]: process 3675 exited,
status 0
-----------------------------------

please note I have cyrus-sasl-plain and cyrus-sasl-Login module installed.