Nagios Support Forum

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https://support.nagios.com/forum/viewtopic.php?f=16&t=49889&start=10

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 vi /etc/nsswitch.conf (change the hosts line to “hosts files dns”, line is in red below)
#
# /etc/nsswitch.conf
#
# An example Name Service Switch config file. This file should be
# sorted with the most-used services at the beginning.
#
# The entry '[NOTFOUND=return]' means that the search for an
# entry should stop if the search in the previous entry turned
# up nothing. Note that if the search failed due to some other reason
# (like no NIS server responding) then the search continues with the
# next entry.
#
# Valid entries include:
#
#       nisplus                 Use NIS+ (NIS version 3)
#       nis                     Use NIS (NIS version 2), also called YP
#       dns                     Use DNS (Domain Name Service)
#       files                   Use the local files
#       db                      Use the local database (.db) files
#       compat                  Use NIS on compat mode
#       hesiod                  Use Hesiod for user lookups
#       [NOTFOUND=return]       Stop searching if not found so far
#

# To use db, put the "db" in front of "files" for entries you want to be
# looked up first in the databases
#
# Example:
#passwd:    db files nisplus nis
#shadow:    db files nisplus nis
#group:     db files nisplus nis

passwd:     files
shadow:     files
group:      files

#hosts:     db files nisplus nis dns
hosts:  dns files

# Example - obey only what nisplus tells us...
#services:   nisplus [NOTFOUND=return] files
#networks:   nisplus [NOTFOUND=return] files
#protocols:  nisplus [NOTFOUND=return] files
#rpc:        nisplus [NOTFOUND=return] files
#ethers:     nisplus [NOTFOUND=return] files
#netmasks:   nisplus [NOTFOUND=return] files

bootparams: nisplus [NOTFOUND=return] files

ethers:     files
netmasks:   files
networks:   files
protocols:  files
rpc:        files
services:   files

netgroup:   nisplus

publickey:  nisplus

automount:  files nisplus
aliases:    files nisplus

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pg_pconnect(): Unable to connect to PostgreSQL server: could not connect to server: Connection timed out
        Is the server running on host "localhost" and accepting
        TCP/IP connections on port 5432? in /usr/local/nagiosxi/html/db/adodb/drivers/adodb-postgres64.inc.php on line 699
<h3>Databse Error</h3>A database connection error has been detected, please follow the repair prompt below. If the issue persists, please contact Nagios support.<p>Run the following from the CLI as root to attempt to repair the DB:<br><pre>/usr/local/nagiosxi/scripts/repair_databases.sh</pre></p>PHP Warning:  pg_pconnect(): Unable to connect to PostgreSQL server: could not connect to server: Connection timed out
        Is the server running on host "localhost" and accepting
        TCP/IP connections on port 5432? in /usr/local/nagiosxi/html/db/adodb/drivers/adodb-postgres64.inc.php on line 699

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[root@xig nagiosxi]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6