NetWorker Management Console UI will not launch due to defunct HTTPD process

• The NetWorker Management Console (NMC) does not launch.
• The NMC server is installed on a Linux server.
• The NMC server's HTTPD process goes to a defunct state after starting the GST service.
• The NMC server's GST service and the Postgres processes remain running

# ps -ef | grep http
nsrnmc   41023 41018  0 10:33 ?        00:00:00 [httpd] <defunct>

# ps -ef | grep post
nsrnmc   41031     1  0 10:33 ?        00:00:00 /opt/lgtonmc/postgres/11.1/bin/postgres -D /nsr/nmc/nmcdb/pgdata
nsrnmc   41032 41031  0 10:34 ?        00:00:00 postgres: logger
nsrnmc   41034 41031  0 10:34 ?        00:00:00 postgres: checkpointer
nsrnmc   41035 41031  0 10:34 ?        00:00:00 postgres: background writer
nsrnmc   41036 41031  0 10:34 ?        00:00:00 postgres: walwriter
nsrnmc   41037 41031  0 10:34 ?        00:00:00 postgres: autovacuum launcher
nsrnmc   41038 41031  0 10:34 ?        00:00:00 postgres: stats collector
nsrnmc   41039 41031  0 10:34 ?        00:00:00 postgres: logical replication launcher
nsrnmc   41050 41031  0 10:34 ?        00:00:00 postgres: lgtogst lgto_gst ::1(44112) idle

• Messages from the /opt/lgtonmc/management/logs/web_output log:

[ssl:warn] [pid 5627:tid 140339033118592] AH01882: Init: this version of mod_ssl was compiled against a newer library (OpenSSL 1.0.2n  7 Dec 2017, version currently loaded is OpenSSL 1.0.2h-fips  3 May 2016) - may result in undefined or erroneous behavior
[ssl:warn] [pid 5627:tid 140339033118592] AH01873: Init: Session Cache is not configured [hint: SSLSessionCache]
[ssl:warn] [pid 5627:tid 140339033118592] AH01909: localhost:9000:0 server certificate does NOT include an ID which matches the server name
[mpm_event:notice] [pid 5627:tid 140339033118592] AH00489: Apache/2.4.38 (Unix) OpenSSL/1.0.2h-fips configured -- resuming normal operations
[core:notice] [pid 5627:tid 140339033118592] AH00094: Command line: '/opt/lgtonmc/apache/bin/httpd -f /opt/lgtonmc/apache/conf/httpd.conf'
[mpm_event:error] [pid 5627:tid 140339033118592] AH10159: server is within MinSpareThreads of MaxRequestWorkers, consider raising the MaxRequestWorkers setting

The httpd.pid file was not deleted when the GST service shuts down.

1. Open an elevated shell on the NMC server.
2. Stop the GST service:

# systemctl stop gst

3. Delete the httpd.pid file

# rm /opt/ lgtonmc/apache/logs/httpd.pid

4. Start the GST service

# systemctl start gst