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I don't think there is a bug. Portreserve only calls bind on that socket and not listen. Which means that the socket will not appear in netstat but effectively it is "reserved".
[root@ci-vm-10-0-137-101 ~]# cat /etc/portreserve/dovecot
imaps/tcp
[root@ci-vm-10-0-137-101 ~]# systemctl restart portreserve.service
[root@ci-vm-10-0-137-101 ~]# netstat -alpen | grep :993 | wc -l # Outputs "0" -> doesn't work!
0
[root@ci-vm-10-0-137-101 ~]# nc -l 993
Ncat: bind to 0.0.0.0:993: Address already in use. QUITTING.
Red Hat Enterprise Linux 7 shipped it's final minor release on September 29th, 2020. 7.9 was the last minor releases scheduled for RHEL 7.
From intial triage it does not appear the remaining Bugzillas meet the inclusion criteria for Maintenance Phase 2 and will now be closed.
From the RHEL life cycle page:
https://access.redhat.com/support/policy/updates/errata#Maintenance_Support_2_Phase
"During Maintenance Support 2 Phase for Red Hat Enterprise Linux version 7,Red Hat defined Critical and Important impact Security Advisories (RHSAs) and selected (at Red Hat discretion) Urgent Priority Bug Fix Advisories (RHBAs) may be released as they become available."
If this BZ was closed in error and meets the above criteria please re-open it flag for 7.9.z, provide suitable business and technical justifications, and follow the process for Accelerated Fixes:
https://source.redhat.com/groups/public/pnt-cxno/pnt_customer_experience_and_operations_wiki/support_delivery_accelerated_fix_release_handbook
Feature Requests can re-opened and moved to RHEL 8 if the desired functionality is not already present in the product.
Please reach out to the applicable Product Experience Engineer[0] if you have any questions or concerns.
[0] https://bugzilla.redhat.com/page.cgi?id=agile_component_mapping.html&product=Red+Hat+Enterprise+Linux+7
Description of problem: The documentation ("man portreserve") says: "UDP services may be specified by appending "/udp" to the service name, and TCP services by "/tcp". Several services may be specified, one per line.". So, let's try: 1. echo imaps/udp > /etc/portreserve/dovecot 2. systemctl restart portreserve.service 3. netstat -alpen | grep :993 | wc -l # Outputs "1" -> works 4. echo 993/udp > /etc/portreserve/dovecot 5. systemctl restart portreserve.service 6. netstat -alpen | grep :993 | wc -l # Outputs "1" -> works 7. echo imaps/tcp > /etc/portreserve/dovecot 8. systemctl restart portreserve.service 9. netstat -alpen | grep :993 | wc -l # Outputs "0" -> doesn't work! 10. echo 993/tcp > /etc/portreserve/dovecot 11. systemctl restart portreserve.service 12. netstat -alpen | grep :993 | wc -l # Outputs "0" -> doesn't work! 13. echo imaps/tcp > /etc/portreserve/dovecot 14. echo pop3s/tcp >> /etc/portreserve/dovecot 15. systemctl restart portreserve.service 16. netstat -alpen | grep :99 | wc -l # Outputs "0" -> doesn't work! 17. echo 993/tcp > /etc/portreserve/dovecot 18. echo 995/tcp >> /etc/portreserve/dovecot 19. systemctl restart portreserve.service 20. netstat -alpen | grep :99 | wc -l # Outputs "0" -> doesn't work! Note that I would prefer using port number rather service name myself, but neither nor works with TCP as it seems. Version-Release number of selected component (if applicable): portreserve-0.0.5-11.el7.x86_64 How reproducible: See above. Actual results: Portreserve does neither handle TCP ports nor multiline ports as documented. Expected results: Portreserve should handle TCP ports and multiline ports as documented.