Problem starting XCOM systemd txpi listener services

Products

• XCOM Data Transport
• XCOM Data Transport - Linux PC

Issue/Introduction

Installed XCOM 12.0 on a RHEL 10.1 system.
Also installed latest Linux 12.0 PTF LU15770 PTF to pick up systemd support for txpi services from the earlier PTF LU11905 ("NEW TXPI SERVICES TO SUPPORT SYSTEMD ON RED HAT 9 AND SUSE 15 SP3") that first introduced it.

xcomqm: CA XCOM Data Transport r12.0 25010 SP00 64bit (for <no SNA support>) 

However after the PTF the new txpi services are not listening on ports 8044, 8045, 8046, 8047 i.e. netstat command does not show them:

#  netstat -na|grep 804
# 

The firewalld is disabled and so is SELinux.

# systemctl status firewalld
○ firewalld.service - firewalld - dynamic firewall daemon
     Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; preset: enabled)
     Active: inactive (dead)
       Docs: man:firewalld(1)
#  

# sestatus
SELinux status:                 disabled
# 

The expected files and symbolic links to them from /etc/systemd/system are present:

# ls -al /apps/CA/XCOM/txpi
total 56
drwxrwxr-x  2 root xcomadm 4096 Nov 10 15:10 .
drwxrwxr-x 21 root root    4096 Nov 10 15:10 ..
-rwxr-----  1 root xcomadm  499 Apr 22  2022 txpi
-rwxr-----  1 root xcomadm  522 Apr 22  2022 txpi6
-rwxr-----  1 root xcomadm  223 Nov 10 15:10 [email protected]
-rwxr-----  1 root xcomadm  580 Nov 10 15:10 txpi6.socket
-rwxr-----  1 root xcomadm  521 Apr 22  2022 txpis
-rwxr-----  1 root xcomadm  526 Apr 22  2022 txpis6
-rwxr-----  1 root xcomadm  226 Nov 10 15:10 [email protected]
-rwxr-----  1 root xcomadm  586 Nov 10 15:10 txpis6.socket
-rwxr-----  1 root xcomadm  208 Nov 10 15:10 [email protected]
-rwxr-----  1 root xcomadm  584 Nov 10 15:10 txpi.socket
-rwxr-----  1 root xcomadm  211 Nov 10 15:10 [email protected]
-rwxr-----  1 root xcomadm  592 Nov 10 15:10 txpis.socket
#

#  ls -ald /etc/systemd/system/txp*
lrwxrwxrwx 1 root root 33 Nov 10 15:11 /etc/systemd/system/[email protected] -> /apps/CA/XCOM/txpi/[email protected]
lrwxrwxrwx 1 root root 31 Nov 10 15:11 /etc/systemd/system/txpi6.socket -> /apps/CA/XCOM/txpi/txpi6.socket
lrwxrwxrwx 1 root root 34 Nov 10 15:11 /etc/systemd/system/[email protected] -> /apps/CA/XCOM/txpi/[email protected]
lrwxrwxrwx 1 root root 32 Nov 10 15:11 /etc/systemd/system/txpis6.socket -> /apps/CA/XCOM/txpi/txpis6.socket
lrwxrwxrwx 1 root root 32 Nov 10 15:11 /etc/systemd/system/[email protected] -> /apps/CA/XCOM/txpi/[email protected]
lrwxrwxrwx 1 root root 30 Nov 10 15:11 /etc/systemd/system/txpi.socket -> /apps/CA/XCOM/txpi/txpi.socket
lrwxrwxrwx 1 root root 33 Nov 10 15:11 /etc/systemd/system/[email protected] -> /apps/CA/XCOM/txpi/[email protected]
lrwxrwxrwx 1 root root 31 Nov 10 15:11 /etc/systemd/system/txpis.socket -> /apps/CA/XCOM/txpi/txpis.socket
# 

The file contents also look to be correct:

# cat [email protected]
[Unit]
Description=XCOM Data Transport TXPI Listener Service
After = network.target

[Service]
ExecStart=-/usr/lib/xcom/xcomtcp REMOTE 0    # the binary to start
User=root
Group=xcomadm
StandardInput=socket
# 
# 
# 

# cat txpi.socket
[Unit]
Description=XCOM Data Transport TXPI Socket

[Socket]
ListenStream=0.0.0.0:8044
Accept=yes                          
#MaxConnections=64
#The maximum number of connections to simultaneously run services instances for, when Accept=yes is set. If more concurrent connections are coming in, they will be refused until at least one existing connection is terminated.
#MaxConnectionsPerSource=
#The maximum number of connections for a service per source IP address. This is very similar to the MaxConnections= directive above. Disabled by default.

[Install]
WantedBy=sockets.target
# 

However the socket service status is not accessible:

# systemctl status txpi.socket
Unit txpi.socket could not be found.
# 

Cause

XCOM™ Data Transport® for UNIX/Linux 12.0

Resolution

It seems that for some reason the system has not processed correctly the existence of the new txpi services in /etc/systemd/system.

Referring to doc. page Configure the Listener Services for systemd, support suggested a manual reload i.e.
# systemctl daemon-reload
# systemctl status txpi.socket

The problem was resolved after reloading the daemon and starting the services txpi.socket, txpis.socket, txpi6.socket, txpis6.socket.

Additional Information

XCOM Data Transport for UNIX/Linux 12.0 > Release Notes > New Features

Related article: XCOM Linux Support for RHEL 9 and SLES 15 SP3 (no xinetd)