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 into directory /apps/CA/XCOM (instead of the default /opt/CA/XCOM)
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 $XCOM_HOME/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.
# 

Environment

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)