[Koha] Can't connect to SIP2 and port 6001 closed

[library at interxs.com.my]

Hi all,
I need your help . I've tried to connect the self check to Koha Server. 
But the SIP2 services can't be upped and the 6001 is closed.

 From log:

1 - root at UKOHA:/var/log/koha/ulibrary# ps -ef | grep SIP
umplibr+ 769 1 0 Sep06 ? 00:00:16 daemon --name=ulibrary-koha-sip 
--errlog=/var/log/koha/ulibrary/sip-error.log 
--stdout=/var/log/koha/ulibrary/sip.log 
--output=/var/log/koha/ulibrary/sip-output.log --verbose=1 --respawn 
--delay=30 --pidfiles=/var/run/koha/ulibrary 
--user=ulibrary-koha.ulibrary-koha -- perl 
/usr/share/koha/lib/C4/SIP/SIPServer.pm 
/etc/koha/sites/ulibrary/SIPconfig.xml
root 92687 92586 0 19:39 pts/3 00:00:00 grep SIP


2 - root at UKOHA:/var/log/koha/ulibrary# nmap -p 6001 110.119.120.118

Starting Nmap 6.47 ( http://nmap.org ) at 2019-09-09 19:39 PDT
Nmap scan report for 110.119.120.118
Host is up (0.000069s latency).
PORT STATE SERVICE
6001/tcp closed X11:1

Nmap done: 1 IP address (1 host up) scanned in 1.15 seconds


3 - SIP-error.log
20190905 21:19:21 ulibrary-koha-sip: client (pid 2907) exited with 255 
status
20190905 21:19:22 ulibrary-koha-sip: client (pid 2908) exited with 255 
status
20190905 21:19:22 ulibrary-koha-sip: client (pid 2909) exited with 255 
status
20190905 21:19:23 ulibrary-koha-sip: client (pid 2910) exited with 255 
status
20190905 21:19:24 ulibrary-koha-sip: client (pid 2911) exited with 255 
status
20190905 21:19:24 ulibrary-koha-sip: terminating too quickly, waiting 30 
secon
ds

4 - root at UKOHA:/etc/koha/sites/ulibrary# koha-shell ulibrary
ulibrary-koha at UKOHA:/etc/koha/sites/ulibrary$ perl 
/usr/share/koha/lib/C4/SIP/SIPServer.pm 
/etc/koha/sites/ulibrary/SIPconfig.xml

mismatched tag at line 144, column 6, byte 5675 at 
/usr/lib/x86_64-linux-gnu/perl5/5.20/XML/Parser.pm line 187.
ulibrary-koha at UKOHA:/etc/koha/sites/ulibrary$

Thanks.

Best Regards,

CHE PAKRUL
SYSTEM ENGINEER