ERROR 2002 (HY000): Can't connect to MySQL server on 'myserverIP' (115)

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mmohamed2

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Feb 1, 2020
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i was trying to access remotly to mysql mariaDB

this is my my.cnf file
Code: 
    #
    # This group is read both both by the client and the server
    # use it for options that affect everything
    #
    [client-server]
    
    #
    # include all files from the config directory
    #
    !includedir /etc/my.cnf.d
    
    [mysqld]
    #skip-networking
    #bind-address = <some ip-address>

something missing in client-server section maybe ?

i restarted mysqld with this command

systemctl restart mysqld

B3p6m.png


there's only one user (the one i used to connect from the other server) and % for thar user's host

i use this command in the other server

mysql -h 5.xxxx -P3306 -u myUsernameInTheOtherServer -pMYPASS -D myDatabaseNameThatHaveThatUser

i got: ERROR 2002 (HY000): Can't connect to MySQL server on '5.x' (115)

the weird thing is

i used this command for the first time

service iptables stop

and suddenly, it connected succeffuly with the same command i used

bwJIe.png


after i exit using ctrl+c, and tried to login again but i got the same error

when i try to connect on the server that have the mysql, using the user i created for the remote connection
i got

ERROR 1045 (28000): Access denied for user
'userIusedForRemoteConn'@'localhost' (using password: YES)

so, if i can't login using that user on the main server, i can't login remotly using it, right ?

here's that user(in red) that i used, can it be the problem from root ?

i'm using da_admin, to create that user and all other commands
UsH4M.png




Hope someone can help!
 
Richard G said:
That is netstat and has nothing to do with your firewall. ;)

Check if the port is opened in your firewall.
Click to expand...
i did
sudo lsof -i -P -n | grep LISTE
and i got from a list
mysqld 13751 mysql 14u IPv4 1331139414 0t0 TCP *:3306 (LISTEN)

also
i did
sudo lsof -i:3306
and i got
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
mysqld 13751 mysql 14u IPv4 1331139414 0t0 TCP *:mysql (LISTEN)
 
for outgoing i did
iptables -A OUTPUT -o eth0 -p tcp --dport 3306-m state --state NEW,ESTABLISHED -j ACCEPT
for incoming i did
iptables -A INPUT -i eth0 -p tcp --dport 3306 -m state --state NEW,ESTABLISHED -j ACCEPT

Is that correct ?
 
mmohamed2 said:
i did
sudo lsof -i -P -n | grep LISTE
Click to expand...
Nope, that is only checking if a port is listening, not if the port is opened or not in the firewall.

I don't know if the iptables command is correctly, I make life easy and use CSF/LFD as firewall for Iptables.
You might try.

Try this from external system:
telnet your.server.ip.addres 3306
if you get a connection then the port is open, if you get a refused, then the port is still closed.
 
Richard G said:
Nope, that is only checking if a port is listening, not if the port is opened or not in the firewall.

I don't know if the iptables command is correctly, I make life easy and use CSF/LFD as firewall for Iptables.
You might try.

Try this from external system:
telnet your.server.ip.addres 3306
if you get a connection then the port is open, if you get a refused, then the port is still closed.
Click to expand...
i did yum install telnet
then
telnet 5.200.16.220 3306
i got
Trying 5.200.16.220...
Connected to 5.200.16.220.
Escape character is '^]'.
R
5.5.41-MariaDB▒RS-&r2=▒qHSKZdgW_Y},mysql_native_passwordConnection closed by foreign host.
 
Code: 
# telnet 5.200.16.220 3306
Trying 5.200.16.220...
telnet: connect to address 5.200.16.220: Connection refused


The port is closed. You need to open it. If you don't know how to do it your self, you'd better get someone who will do it for you. There is too much risk that you lock yourself out of the server if you try to modify iptables rules without having enough expirience.


To make the things easier you could install CSF/LFD. Search the help pages and forums for detailed instructions.
 
And i presume 5.200.16.220 is your server ip? I said "try from external system".

If I do try to connect it says:
[root@server: /etc/csf]# telnet 5.200.16.220 3306
Trying 5.200.16.220...
telnet: connect to address 5.200.16.220: Connection refused
so port is not open.

Edit: Posted at the same time with Zeiter. I would suggest to take Zeiter's advise.
 
@Richard G @zEitEr looks like the port is open
1582040205286.png


and someone respond: You did connect. You got no error message from telnet, and you got a response from MariaDB, as you can see for yourself. Ergo the port is open. Your problem lies elsewhere

maybe something in !includedir /etc/my.cnf.d in my.cnf file ?
 
Still the same:

Code: 
$ telnet 5.200.16.220 3306
Trying 5.200.16.220...
telnet: connect to address 5.200.16.220: Connection refused

and

2020-02-18 23.24.40 www.yougetsignal.com 565ce6f20115.png


We post here results of tests from our sides. So that's up to you whether or not you take them into a consideration.
 
@zEitEr Sadly, I got similiar issue. Outgoing from host to Remote MYSQL will be available for the host a brief moment(around 5 minutes)
when I stop iptables. and then just stop with Connection Refused Error.
It's not problem with MYSQL Server because It's still can be access anywhere else but host.
and when I stop iptables It's start working again before iptables kick back in.
**when iptables kick back in. I got its own configuration not the one that I save and apply

Maybe iptables block anything not included in its rules
these are the rules I tried so far but none working
-A OUTPUT ! -o lo -p tcp -m conntrack --ctstate NEW -m tcp --dport 3306 -j ACCEPT
-A OUTPUT -p tcp -d localhost --sport 3306 ! --syn -j ACCEPT
-A OUTPUT -o eth0 -p tcp --dport 3306 -m state --state NEW,ESTABLISHED -j ACCEPT

If it can be solve with iptables rules would be nice or perhaps disable iptables permanently ?
Anyway to solve this issue ?
 
Oh i see there is csf that control iptables and prevent any changes
there is csf configuration inside directadmin already.
Just put a new port in and it's works!

Solved :D
 
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