[IP.Board 3.2.3] LAN and Registration error, how to fix?

Question

CMS

Good day to all!
There was such a problem with IP.Board 3.2.3, when sending a LAN and registering, an error occurs with the database.

There was a problem when working with SQL server:
mySQL query error: SELECT * FROM dev_ruscache_store WHERE cs_key IN ( 'notifications' )
This problem is not an error inside IP.Board and is most likely related to problems in your SQL server. Try to report this problem to your hosting provider.

The following is in the log:
Log - Date: Sat, 18 Aug 2012 08:37:26 +0000
Error: 2006 - MySQL server has gone away
IP Address: ***.**.**.*** - /index.php ?app=members&module=messaging§ion=send&do=send
- mySQL query error: SELECT * FROM dev_ruscache_store WHERE cs_key IN ( 'notifications' )
.--------------------- -------------------------------------------------- -------------------------------------------------- -------------------------------------------------- ----.
| file | function | Line no. |
|------------------------------------------------- ------------------+---------------------- -------------------------------------------------- -------+--------------------|
| admin/sources/base/ipsRegistry.php | [ips_CacheRegistry]._loadCaches | 3138 |
'------------------------------------------------- ------------------+---------------------- -------------------------------------------------- -------+--------------------'
| admin/sources/classes/member/notifications.php | [ips_CacheRegistry].getCache | 441 |
'------------------------------------------------- ------------------+---------------------- -------------------------------------------------- -------+--------------------'
| admin/sources/classes/member/notifications.php | [notifications].getDefaultNotificationConfig | 482 |
'------------------------------------------------- ------------------+---------------------- -------------------------------------------------- -------+--------------------'
| admin/sources/classes/member/notifications.php | [notifications].getMemberNotificationConfig | 587 |
'------------------------------------------------- ------------------+---------------------- -------------------------------------------------- -------+--------------------'
| admin/applications/members/sources/classes/messaging/messengerFunctions.php| [notifications].sendNotification | 1929 |
'------------------------------------------------- ------------------+---------------------- -------------------------------------------------- -------+-----'
| admin/applications/members/modules_public/messaging/send.php | [messengerFunctions].sendNewPersonalTopic | 500 |
'------------------------------------------------- ------------------+---------------------- -------------------------------------------------- -------+--------------------'
| admin/applications/members/modules_public/messaging/send.php | [public_members_messaging_send]._sendNewPersonalTopic | 184 |
'------------------------------------------------- ------------------+---------------------- -------------------------------------------------- -------+--------------------'
| admin/sources/base/ipsController.php | [public_members_messaging_send].doExecute | 302 |
'------------------------------------------------- ------------------+---------------------- -------------------------------------------------- -------+-------------------'

I googled, another chela had such a problem, but it was never solved.
In fact, the messages reach, but when you try to send a reply on the forum it says:

You cannot write a message
All participants in the conversation have already left it

the same error appears when registering a user, but the user is registered.

Tell me what to do to fix the error?

Answer 1

> Error: 2006 - MySQL server has gone away
MySQL could not give the whole result -> check the maximum packet size and timeout (well, google to the rescue). Yes, and IPB itself would be nice to update.

Answer 2

wait_timeout 10