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2024-03-13 14:47:13.937 IST [7220] LOG: invalid CIDR mask in address "127.0.0.1/33" postgres

Wide-eyed Wolverine answered on March 13, 2024 Popularity 1/10 Helpfulness 1/10

answer 2024-03-13 14:47:13.937 IST [7220] LOG: invalid CIDR mask in address "127.0.0.1/33" postgres

2024-03-13 14:47:13.937 IST [7220] LOG: invalid CIDR mask in address "127.0.0.1/33" postgres

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The PostgreSQL log message "invalid CIDR mask in address '127.0.0.1/33'"
indicates that there is an issue with the CIDR (Classless Inter-Domain Routing)
notation used for an address in PostgreSQL. 
In this specific case, the CIDR mask specified for the IPv4 address
"127.0.0.1" is invalid.

In CIDR notation, the mask specifies the number of significant bits in the
network prefix. For IPv4 addresses, valid CIDR masks typically range from
0 to 32, inclusive. The error "invalid CIDR mask in address '127.0.0.1/33'"
suggests that the specified CIDR mask is 33, which is outside the valid range
for IPv4 addresses.

To resolve this issue, you should check the PostgreSQL configuration files, 
especially the pg_hba.conf file, for any entries that use CIDR notation
with an invalid mask. Look for entries similar to the following:

#pg_hba.conf
host    all             all             127.0.0.1/33        md5

To fix the problem:

Open the pg_hba.conf file in a text editor.

Locate the entry that uses CIDR notation with an invalid mask.

Correct the CIDR mask to be within the valid range (0 to 32).

For example, change "127.0.0.1/33" to "127.0.0.1/32":

#pg_hba.conf
host    all             all             127.0.0.1/32        md5
Save the changes to the pg_hba.conf file.

Reload or restart the PostgreSQL server to apply the changes

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Contributed on Mar 13 2024

Wide-eyed Wolverine

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2024-03-13 14:47:13.937 IST [7220] LOG: invalid CIDR mask in address "127.0.0.1/33" postgres

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