Freeradius stops. Received HUP signal.

[substance SUBSTANCE]

Hello guys.

I'm using FreeRADIUS server for a few months now. I'm running it on Ubuntu
11.10 server. FreeRADIUS Version 2.1.10.

The problem is that I started FreeRADIUS daemon on November 18th, and it
stopped working after one week ( users authentication was not working).

Sun Nov 18 06:30:58 2012 : Info: HUP - loading modules
Sun Nov 18 06:30:58 2012 : Info:  Module: Reloaded module "files"
Sun Nov 18 06:30:58 2012 : Info:  Module: Reloaded module
"attr_filter.access_reject"
Sun Nov 18 06:30:58 2012 : Info:  Module: Reloaded module
"attr_filter.accounting_response"
Sun Nov 18 06:30:58 2012 : Info:  Module: Reloaded module "pap"
Sun Nov 18 06:30:58 2012 : Info:  Module: Reloaded module "detail"
Sun Nov 18 06:30:58 2012 : Info:  Module: Reloaded module "sql_log"
Sun Nov 18 06:30:58 2012 : Info:  Module: Reloaded module "auth_log"
Sun Nov 18 06:30:58 2012 : Info:  Module: Reloaded module "suffix"
Sun Nov 18 06:30:58 2012 : Info:  Module: Reloaded module "radutmp"
Sun Nov 18 06:30:58 2012 : Info: Loaded virtual server inner-tunnel
Sun Nov 18 06:30:58 2012 : Info: Loaded virtual server <default>
Sun Nov 18 19:12:12 2012 : Info: rlm_sql (sql): Attempting to connect
rlm_sql_mysql #1
Sun Nov 18 19:12:12 2012 : Info: rlm_sql_mysql: Starting connect to MySQL
server for #1
Sun Nov 18 19:12:12 2012 : Info: rlm_sql (sql): Connected new DB handle, #1
Sun Nov 18 19:12:12 2012 : Info: rlm_sql (sql): Attempting to connect
rlm_sql_mysql #0
Sun Nov 18 19:12:12 2012 : Info: rlm_sql_mysql: Starting connect to MySQL
server for #0
Sun Nov 18 19:12:12 2012 : Info: rlm_sql (sql): Connected new DB handle, #0
Sun Nov 18 19:12:12 2012 : Info: rlm_sql (sql): Attempting to connect
rlm_sql_mysql #4
Sun Nov 18 19:12:12 2012 : Info: rlm_sql_mysql: Starting connect to MySQL
server for #4
Sun Nov 18 19:12:12 2012 : Info: rlm_sql (sql): Connected new DB handle, #4
Sun Nov 18 19:12:12 2012 : Info: rlm_sql (sql): Attempting to connect
rlm_sql_mysql #3
Sun Nov 18 19:12:12 2012 : Info: rlm_sql_mysql: Starting connect to MySQL
server for #3
Sun Nov 18 19:12:12 2012 : Info: rlm_sql (sql): Connected new DB handle, #3
Sun Nov 18 19:13:33 2012 : Info: Loaded virtual server inner-tunnel
Sun Nov 18 19:13:33 2012 : Info: rlm_sql (sql): Driver rlm_sql_mysql
(module rlm_sql_mysql) loaded and linked
Sun Nov 18 19:13:33 2012 : Info: rlm_sql (sql): Attempting to connect to
root at localhost:/radius
Sun Nov 18 19:13:33 2012 : Info: rlm_sql (sql): Attempting to connect
rlm_sql_mysql #0
Sun Nov 18 19:13:33 2012 : Info: rlm_sql_mysql: Starting connect to MySQL
server for #0
Sun Nov 18 19:13:33 2012 : Info: rlm_sql (sql): Connected new DB handle, #0
Sun Nov 18 19:13:33 2012 : Info: rlm_sql (sql): Attempting to connect
rlm_sql_mysql #1
Sun Nov 18 19:13:33 2012 : Info: rlm_sql_mysql: Starting connect to MySQL
server for #1
Sun Nov 18 19:13:33 2012 : Info: rlm_sql (sql): Connected new DB handle, #1
Sun Nov 18 19:13:33 2012 : Info: rlm_sql (sql): Attempting to connect
rlm_sql_mysql #2
Sun Nov 18 19:13:33 2012 : Info: rlm_sql_mysql: Starting connect to MySQL
server for #2
Sun Nov 18 19:13:33 2012 : Info: rlm_sql (sql): Connected new DB handle, #2
Sun Nov 18 19:13:33 2012 : Info: rlm_sql (sql): Attempting to connect
rlm_sql_mysql #3
Sun Nov 18 19:13:33 2012 : Info: rlm_sql_mysql: Starting connect to MySQL
server for #3
Sun Nov 18 19:13:33 2012 : Info: rlm_sql (sql): Connected new DB handle, #3
Sun Nov 18 19:13:33 2012 : Info: rlm_sql (sql): Attempting to connect
rlm_sql_mysql #4
Sun Nov 18 19:13:33 2012 : Info: rlm_sql_mysql: Starting connect to MySQL
server for #4
Sun Nov 18 19:13:33 2012 : Info: rlm_sql (sql): Connected new DB handle, #4
Sun Nov 18 19:13:33 2012 : Info: Loaded virtual server <default>
Sun Nov 18 19:13:33 2012 : Info: Ready to process requests.
*Sun Nov 25 06:46:34 2012 : Info: Received HUP signal.*
Sun Nov 25 06:46:34 2012 : Info: HUP - Re-reading configuration files
Sun Nov 25 06:46:34 2012 : Info: HUP - loading modules
Sun Nov 25 06:46:34 2012 : Info:  Module: Reloaded module "files"
Sun Nov 25 06:46:34 2012 : Info:  Module: Reloaded module
"attr_filter.access_reject"
Sun Nov 25 06:46:34 2012 : Info:  Module: Reloaded module
"attr_filter.accounting_response"
Sun Nov 25 06:46:34 2012 : Info:  Module: Reloaded module "pap"
Sun Nov 25 06:46:34 2012 : Info:  Module: Reloaded module "detail"
Sun Nov 25 06:46:34 2012 : Info:  Module: Reloaded module "sql_log"
Sun Nov 25 06:46:34 2012 : Info:  Module: Reloaded module "auth_log"
Sun Nov 25 06:46:34 2012 : Info:  Module: Reloaded module "suffix"
Sun Nov 25 06:46:34 2012 : Info:  Module: Reloaded module "radutmp"
Sun Nov 25 06:46:34 2012 : Info: Loaded virtual server inner-tunnel
Sun Nov 25 06:46:34 2012 : Info: Loaded virtual server <default>
Sun Nov 25 18:23:51 2012 : Info: rlm_sql (sql): Attempting to connect
rlm_sql_mysql #2
Sun Nov 25 18:23:51 2012 : Info: rlm_sql_mysql: Starting connect to MySQL
server for #2
Sun Nov 25 18:23:51 2012 : Info: rlm_sql (sql): Connected new DB handle, #2
Sun Nov 25 18:23:51 2012 : Info: rlm_sql (sql): Attempting to connect
rlm_sql_mysql #1
Sun Nov 25 18:23:51 2012 : Info: rlm_sql_mysql: Starting connect to MySQL
server for #1
Sun Nov 25 18:23:51 2012 : Info: rlm_sql (sql): Connected new DB handle, #1
Sun Nov 25 18:23:51 2012 : Info: rlm_sql (sql): Attempting to connect
rlm_sql_mysql #0
Sun Nov 25 18:23:51 2012 : Info: rlm_sql_mysql: Starting connect to MySQL
server for #0
Sun Nov 25 18:23:51 2012 : Info: rlm_sql (sql): Connected new DB handle, #0
Sun Nov 25 18:23:51 2012 : Info: rlm_sql (sql): Attempting to connect
rlm_sql_mysql #4
Sun Nov 25 18:23:51 2012 : Info: rlm_sql_mysql: Starting connect to MySQL
server for #4
Sun Nov 25 18:23:51 2012 : Info: rlm_sql (sql): Connected new DB handle, #4
Sun Nov 25 18:24:16 2012 : Info: rlm_sql (sql): Attempting to connect
rlm_sql_mysql #3
Sun Nov 25 18:24:16 2012 : Info: rlm_sql_mysql: Starting connect to MySQL
server for #3
Sun Nov 25 18:24:16 2012 : Info: rlm_sql (sql): Connected new DB handle, #3
*Sun Dec  2 06:38:05 2012 : Info: Received HUP signal.*
Sun Dec  2 06:38:05 2012 : Info: HUP - Re-reading configuration files

Why FreeRADIUS receives that HUP signal? Can I disable it , or should I
update FreeRADIUS software?

Thanks !
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