Can't login from linux openscsi initiator - iSCSI PDU timed out

[irs111]

Hello
I'm trying to configure iSCSI connectrion from Ubuntu 20.04 (open-scsi) to Qnap ts-832px-4g but, when I'm trying to login i get an error:

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root@c4e-backupsrv:/etc/iscsi# sudo iscsiadm -m node --login 
Logging in to [iface: default, target: iqn.2004-04.com.qnap:ts-832px:iscsi.test.7da889, portal: 10.0.0.10,3260] (multiple)
iscsiadm: Could not login to [iface: default, target: iqn.2004-04.com.qnap:ts-832px:iscsi.test.7da889, portal: 10.0.0.10,3260].
iscsiadm: initiator reported error (11 - iSCSI PDU timed out)
iscsiadm: Could not log into all portals

---
target/portal discovery seems to be fine:

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root@c4e-backupsrv:/etc/iscsi# sudo iscsiadm -m discovery -t sendtargets -p 10.0.0.10 
10.0.0.10:3260,1 iqn.2004-04.com.qnap:ts-832px:iscsi.test.7da889

root@c4e-backupsrv:/etc/iscsi# sudo iscsiadm -m node -o show 
# BEGIN RECORD 2.0-874
[...]
node.discovery_port = 3260
node.discovery_type = send_targets
node.session.initial_cmdsn = 0
node.session.initial_login_retry_max = 8
node.session.xmit_thread_priority = -20
node.session.cmds_max = 128
node.session.queue_depth = 32
node.session.nr_sessions = 1
node.session.auth.authmethod = CHAP
node.session.auth.username = test
node.session.auth.password = ********
node.session.auth.username_in = <empty>
node.session.auth.password_in = <empty>
node.session.timeo.replacement_timeout = 120
node.session.err_timeo.abort_timeout = 15
node.session.err_timeo.lu_reset_timeout = 30
node.session.err_timeo.tgt_reset_timeout = 30
node.session.err_timeo.host_reset_timeout = 60
[...]
# END RECORD

Both - target and initiator are in the same LAN segment, there is no firewall betwen them.
iSCSI ACL is default
I've checked credentials many times and they are equal.
How can I debug this issue?
Please, help!

[irs111]

UPDATE: journalctl shows:

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Feb 24 11:59:43 c4e-backupsrv sudo[111153]:   ubuntu : TTY=pts/1 ; PWD=/home/ubuntu ; USER=root ; COMMAND=/usr/bin/su
Feb 24 11:59:43 c4e-backupsrv sudo[111153]: pam_unix(sudo:session): session opened for user root by ubuntu(uid=0)
Feb 24 11:59:43 c4e-backupsrv su[111154]: (to root) ubuntu on pts/1
Feb 24 11:59:43 c4e-backupsrv su[111154]: pam_unix(su:session): session opened for user root by ubuntu(uid=0)
Feb 24 12:09:49 c4e-backupsrv sudo[111169]:     root : TTY=pts/1 ; PWD=/etc/iscsi ; USER=root ; COMMAND=/usr/sbin/iscsiadm -m discovery -t sendtargets -p 10.0.0.10
Feb 24 12:09:49 c4e-backupsrv sudo[111169]: pam_unix(sudo:session): session opened for user root by ubuntu(uid=0)
Feb 24 12:09:49 c4e-backupsrv sudo[111169]: pam_unix(sudo:session): session closed for user root
Feb 24 12:10:12 c4e-backupsrv sudo[111172]:     root : TTY=pts/1 ; PWD=/etc/iscsi ; USER=root ; COMMAND=/usr/sbin/iscsiadm -m node -o show
Feb 24 12:10:12 c4e-backupsrv sudo[111172]: pam_unix(sudo:session): session opened for user root by ubuntu(uid=0)
Feb 24 12:10:12 c4e-backupsrv sudo[111172]: pam_unix(sudo:session): session closed for user root
Feb 24 12:10:34 c4e-backupsrv sudo[111174]:     root : TTY=pts/1 ; PWD=/etc/iscsi ; USER=root ; COMMAND=/usr/sbin/iscsiadm -m node --login
Feb 24 12:10:34 c4e-backupsrv sudo[111174]: pam_unix(sudo:session): session opened for user root by ubuntu(uid=0)
Feb 24 12:10:34 c4e-backupsrv kernel: scsi host2: iSCSI Initiator over TCP/IP
Feb 24 12:12:48 c4e-backupsrv sudo[111174]: pam_unix(sudo:session): session closed for user root
Feb 24 12:12:48 c4e-backupsrv iscsid[109333]: Connection7:0 to [target: iqn.2004-04.com.qnap:ts-832px:iscsi.test.7da889, portal: 10.0.0.10,3260] through [iface: default] is shutdown.
Feb 24 12:17:01 c4e-backupsrv CRON[111189]: pam_unix(cron:session): session opened for user root by (uid=0)
Feb 24 12:17:01 c4e-backupsrv CRON[111190]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Feb 24 12:17:01 c4e-backupsrv CRON[111189]: pam_unix(cron:session): session closed for user root
Feb 24 12:19:25 c4e-backupsrv sudo[111192]:     root : TTY=pts/1 ; PWD=/etc/iscsi ; USER=root ; COMMAND=/usr/sbin/iscsiadm -m node --login
Feb 24 12:19:25 c4e-backupsrv sudo[111192]: pam_unix(sudo:session): session opened for user root by ubuntu(uid=0)
Feb 24 12:19:25 c4e-backupsrv kernel: scsi host2: iSCSI Initiator over TCP/IP
Feb 24 12:21:39 c4e-backupsrv sudo[111192]: pam_unix(sudo:session): session closed for user root
Feb 24 12:21:39 c4e-backupsrv iscsid[109333]: Connection8:0 to [target: iqn.2004-04.com.qnap:ts-832px:iscsi.test.7da889, portal: 10.0.0.10,3260] through [iface: default] is shutdown.
Feb 24 12:39:10 c4e-backupsrv sudo[111227]:     root : TTY=pts/1 ; PWD=/etc/iscsi ; USER=root ; COMMAND=/usr/sbin/iscsiadm -m discovery -t sendtargets -p 10.0.0.10 -P 1
Feb 24 12:39:10 c4e-backupsrv sudo[111227]: pam_unix(sudo:session): session opened for user root by ubuntu(uid=0)
Feb 24 12:39:10 c4e-backupsrv sudo[111227]: pam_unix(sudo:session): session closed for user root
Feb 24 12:43:09 c4e-backupsrv sudo[111229]:     root : TTY=pts/1 ; PWD=/etc/iscsi ; USER=root ; COMMAND=/usr/sbin/iscsiadm -m node --login
Feb 24 12:43:09 c4e-backupsrv sudo[111229]: pam_unix(sudo:session): session opened for user root by ubuntu(uid=0)
Feb 24 12:43:09 c4e-backupsrv kernel: scsi host2: iSCSI Initiator over TCP/IP
Feb 24 12:43:42 c4e-backupsrv sudo[111229]: pam_unix(sudo:session): session closed for user root

[FSC830]

Just seen...

I do not have had any issues with Ubuntu and iSCSI in my environment, but I didnt use CHAP yet.
My recommendation is to start as simple as possible, use no authentication and check, if access is possible.
If this works, go on with CHAP.

Regards