RedHat9:How to find what is blocking the port 1526/tcp

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semanage-port

semanage-port(8)														  semanage-port(8)

NAME

       semanage port- SELinux Policy Management port mapping tool

SYNOPSIS

       semanage  port  [-h]  [-n]  [-N]  [-s STORE] [ --add -t TYPE -p PROTOCOL -r RANGE port_name | port_range | --delete -p PROTOCOL port_name |
       port_range | --deleteall | --extract | --list [-C] | --modify -t TYPE -p PROTOCOL -r RANGE port_name | port_range ]

DESCRIPTION

       semanage is used to configure certain elements of SELinux policy without requiring modification to or recompilation  from  policy  sources.
       semanage port controls the port number to port type defitions.

OPTIONS

       -h, --help
	      show this help message and exit

       -n, --noheading
	      Do not print heading when listing the specified object type

       -N, --noreload
	      Do not reload policy after commit

       -S STORE, --store STORE
	      Select an alternate SELinux Policy Store to manage

       -C, --locallist
	      List local customizations

       -a, --add
	      Add a record of the specified object type

       -d, --delete
	      Delete a record of the specified object type

       -m, --modify
	      Modify a record of the specified object type

       -l, --list
	      List records of the specified object type

       -E, --extract
	      Extract customizable commands, for use within a transaction

       -D, --deleteall
	      Remove all local customizations

       -t TYPE, --type TYPE
	      SELinux type for the object

       -r RANGE, --range RANGE
	      MLS/MCS  Security  Range	(MLS/MCS  Systems only) SELinux Range for SELinux login mapping defaults to the SELinux user record range.
	      SELinux Range for SELinux user defaults to s0.

       -p PROTO, --proto PROTO
	      Protocol for the specified port (tcp|udp) or internet protocol version for the specified node (ipv4|ipv6).

EXAMPLE

       List all port defitions
       # semanage port -l
       Allow Apache to listen on tcp port 81
       # semanage port -a -t http_port_t -p tcp 81
       Allow sshd to listen on tcp port 8991
       # semanage port -a -t ssh_port_t -p tcp 8991

SEE ALSO

       selinux (8), semanage (8)

AUTHOR

       This man page was written by Daniel Walsh <dwalsh@redhat.com>

								     20130617							  semanage-port(8)

Cybersecurity