This question already has an answer here:
Can't Connect to PostgreSQL with PHP pg_connect()
(1 answer)
Closed 8 years ago.
Connecting to a PostgreSQL database via a remote IP address, I have been successful via Windows using pgAdmin III, but I get errors whenever I try connecting from my local CentOS 6 Apache web server using the standard php-pgsql library using pg_connect().
Notes:
I am not in control of the remote server, but could inquire about additional info if needed.
My password does contain a special character (although it's not a quote character).
Creds are as follows:
Host (IP): xx.xx.xx.xx
Port: 5432
DBname: sandbox
Username: abc
Password: ***
MaintenanceDB: template1
This is the PHP code I have attempted to run in my local server:
pg_connect("host=xx.xx.xx.xx port=5432 dbname=sandbox user=abc password=***");
I've also tried:
pg_connect("host=xx.xx.xx.xx port=5432 dbname=template1 user=abc password=***");
When I attempt to connect, I receive the following error:
Warning: pg_connect(): Unable to connect to PostgreSQL server: could not connect to server: Permission denied Is the server running on host "xx.xx.xx.xx" and accepting TCP/IP connections on port 5432?
I have added/uncommented extension=pgsql.so in the /etc/php.d/ directory and service httpd restart. I've even gone as far as opening my iptables ports as such so there should be no doubt about local firewall ports being blocked:
-A INPUT -m state --state NEW -m tcp -p tcp --dport 5432 -j ACCEPT
-A INPUT -m state --state NEW -m udp -p udp --dport 5432 -j ACCEPT
Thanks in advance :-)
As per your postgresql connection problem, this solution may work. i just take this answer from php manual and i am not sure about it, so please see here for more http://php.net/manual/en/function.pg-connect.php#38291
You should try to leave the host= and port= parts out of the connection string. This sounds strange, but this is an "option" of Postgre. If you have not activated the TCP/IP port in postgresql.conf then postgresql doesn't accept any incoming requests from an TCP/IP port.
Related
The title might make this seem like a duplicate of some existing questions here on SO, but its kind of not in a way, in my opinion.
8140863, 30617357, 27749691
But I can't for the life of me make the answers to these threads work, instead of asking questions on those threads, I would like to create my own question, I'd like to discuss my setup and then my problem, and then what I've tried
My server setup is this, I have a local(an actual physical machine) and a VPS I'm renting, both are running at Centos7.x, PostgreSQL10, Php 7.x, and Python-2.x, BOTH can ping and ssh each other through a VPN just fine.
Both can connect to their own respective databases just fine through PHP, Python, PSQL Terminal
On my VPS Server, I can connect to my Local Server's PostgreSQL database using Python(psycopg2), PHP(php-pgsql) and Terminal(psql) totally fine.
On my local server, I can connect to my VPS PostgreSQL using Python(psycopg2) and Terminal(psql) EXCEPT through PHP(php-pgsql)
Whenever I connect to VPS's PostgreSQL through PHP, I'm getting this error like everyone else
pg_connect(): Unable to connect to PostgreSQL server:
could not connect to server: Permission denied
Is the server running on host "123.456.0.789" and accepting TCP/IP connections on port 5432?
Here are what I've done.
On postgresql.conf set listen_address = "*" -- this is OK
Added pg_hba entries for both -- this is OK (python and terminal can connect on both)
Port 5432/tcp is both enabled and allowed -- this is OK
Selinux is disabled -- this is the answers for the thread referenced above, but it doesn't work for me even after reboot of course.
these are the result of my netstat
#netstat -na | grep 5432
tcp 0 0 0.0.0.0:5432 0.0.0.0:* LISTEN
tcp6 0 0 :::5432 :::* LISTEN
tcp6 0 94 ::1:55110 ::1:5432 ESTABLISHED
tcp6 0 0 ::1:5432 ::1:55060 ESTABLISHED
tcp6 0 0 ::1:5432 ::1:55110 ESTABLISHED
tcp6 12 0 ::1:5432 ::1:55108 ESTABLISHED
tcp6 0 12 ::1:55108 ::1:5432 ESTABLISHED
tcp6 0 0 ::1:55060 ::1:5432 ESTABLISHED
unix 2 [ ACC ] STREAM LISTENING 31102 /var/run/postgresql/.s.PGSQL.5432
unix 2 [ ACC ] STREAM LISTENING 31104 /tmp/.s.PGSQL.5432
iptables
#iptables-save | grep 5432
-A IN_public_allow -p tcp -m tcp --dport 5432 -m conntrack --ctstate NEW,UNTRACKED -j ACCEPT
getenforce
#getenforce
Disabled
Selinux
#/usr/sbin/sestatus | grep SELinux
SELinux status: disabled
#sudo setsebool -P httpd_can_network_connect_db 1
setsebool: SELinux is disabled.
postgresql.conf
listen_addresses = '*'
port = 5432
pg_hba.conf (i just changed the ip for posting here) I tried using trust, but its still the same
# "local" is for Unix domain socket connections only
local all all password
# IPv4 local connections:
host all all 127.0.0.1/32 password
host all all 123.456.0.1/32 password
host all all 123.456.0.11/32 password
host all all 123.456.0.20/32 password
# IPv6 local connections:
host all all ::1/128 password
edit start: My PHP pg_connect code (I just changed the IP just for this post, but it points to the VPS IP)
$pgcon = pg_connect("dbname=database1 user=some_user password=some_password host=123.456.0.789");
edit end : ==
I would like to emphasize that BOTH servers can connect on each others and their own PostgreSQL database through other means, with the exception of my Local Server, it couldn't connect to VPS PostgreSQL using PHP.
VPS To Self(localhost connection)
VPS to Self via PHP is OK
VPS to Self via Python is OK
VPS to Self via PSQL(Terminal) is OK
VPS To Local Server(Connecting using Local Server's VPN IP)
VPS to Local Server via PHP is OK
VPS to Local Server via Python is OK
VPS to Local Server via PSQL(Terminal) is OK
Local Server to Self(localhost connection)
Local Server to Self via PHP is OK
Local Server to Self via Python is OK
Local Server to Self via PSQL(Terminal) is OK
Local Server to VPS(Connecting using VPS's IP by VPN and Public IP)
Local Server to VPS via Python is OK
Local Server to VPS via PSQL(Terminal) is OK
Local Server to VPS via PHP Is NOT OK
I'm really sorry for the long thread, I wanted to give as much information as I can.
Let's split error by types. I'd made several tests with your case and what I found:
If we mess with connection parameters (i.e. wrong port, or IP address) we get the error "could not connect to server: Connection refused" or "Operation timed out
Is the server running on host "128.0.0.1" and accepting")
If we mess with credentials, we get the error "FATAL: password authentication failed for user ..."
Permission denied can be thrown only if you have not permissions to open a TCP connection from your PHP library.
Pls, double-check if you disable SElinux on your Local Server as for me, this is still the closest workaround for your problem.
I'm having issues connecting to my AWS EC2 Server holding a MySQL Server.
Here's my Response from mysqli_connect
p#xxx.com [~/app]# php checkmysqlremote.php
Error: Unable to connect to MySQL.
Debugging errno: 2002
Debugging error: Connection refused
Here's my netstat -tuplen on the EC2 Server containing the MySQL Server
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 999 20299 1378/mysqld
As you can see its binding to the 0.0.0.0 address correctly.
I enabled the 3306 port in inbound rules for EC2.
on the server making the request handshake, I ran:
curl -s example.com:3306 >/dev/null && echo Success. || echo Fail.
which resulted in Fail.
I also ran it on the local server instance and it responded with Success.
I also ran nmap on the server making the handshake,
nmap -p 3306 example.com
Nmap scan report for example.com (1.1.1.1)
Host is up (0.048s latency).
PORT STATE SERVICE
3306/tcp filtered mysql
Nmap done: 1 IP address (1 host up) scanned in 2.03 seconds
Lastly, I tried adding the following rules in iptables:
iptables -A INPUT -i eth0 -s "example.com" -p tcp --destination-port 3306 -j ACCEPT
and
sudo iptables -I INPUT -i eth0 -p tcp -m tcp --dport 3306 -j ACCEPT
I don't know what to do at this point.
UPDATE
I tried pinging the EC2 server from the remote server and it did not return anything. At this point i think the issue is with EC2.
Try adding the follwing GRANT to your user:
GRANT ALL PRIVILEGES ON *.* TO 'user'#'ipadress'
Sounds like the port might not be getting forwarded correctly? One thing to try might be to put an Amazon Elastic Load Balancer in front of the instance. Then you can forward port 3306 for the MySQL connection.
I am trying to connect to mysql remotely. Because this is such a common question I read several tutorials/questions but I keep getting this error:
ERROR 2003 (HY000): Can't connect to MySQL server on 'the-ip-address' (60)
I edited the /etc/mysql/my.cnf and commented the line of bind_address like this:
#bind-address = 127.0.0.1
After that I ran:
$ sudo service mysql restart
with the output of:
mysql stop/waiting
mysql start/running, process 9853
mysql is running on default port: 3306
Using the user with which I am trying to connect remotely is working locally on the server (I can connect to the mysql from the server).
In phpmyadmin I configure these users:
user#localhost
user#127.0.0.1
user#87.45.34.23
Then I am trying to connect with the following:
mysql -u user -p -h 87.45.34.23
Maybe I am missing something... Thank you in advanced
UPDATE
As #Geoffrey suggested in the comments the problem was with a firewall. For this reason I will accept his answer although the answer itself is not for that but in the comments he was right.
Connection refused means the MySQL server is not listening or is firewalled.
By commenting out the bind line, MySQL doesn't bind to anything and only allows local socket access, you need to bind it to either the local IP, or all IPs by specifying 0.0.0.0
Also ensure that skip-networking is not set anywhere.
I need solution for Centralized DB.
We have DB in one Hosting server (Azure Redhat virtual server) and we need to use the same db in other hosting server too. So it will be centralized DB for both server. I can not use it in navicat also if I use IP of Mysql DB.
I have tried using ( bind-address= IP address of the server where db is hosted ) in My.cnf file but it doesn't allow remote access. to use it in other hosting server nor in any mysql client like navicat / Heidi sql.
Also I have added the port 3306 rule in azure server for inbound security.
Thanks in advance for help.
As Azure VMs disable ICMP and we can use SSH tunnels to allow outside access to internal network resources.
Please try to follow this post, created a SSH tunnel in VM which hosted the MySQL server:
Open port 3306, so a remote client can connect to your MySQL Server. Run the following command to open TCP port 3306
iptables -A INPUT -i eth0 -p tcp -m tcp --dport 3306 -j ACCEPT
Now let’s check if the port 3306 is open by running this command:
sudo netstat -anltp|grep :3306
Create a SSH tunnel for port 3307
sudo ssh -fNg -L 3307:127.0.0.1:3306 azurevmuser#servername
Create an endpoint for the port 3307 rule in azure server for inbound security. Now your Database host name is <VM_ip>:3307
Any further concern, please feel free to let me know.
This question already has an answer here:
Can't Connect to PostgreSQL with PHP pg_connect()
(1 answer)
Closed 8 years ago.
I have a CentOS 6.5 virtual machine, which run on VirtualBox.
On it I have set up Apache, PHP, PHP Postgres extension (php-pgsql) and Postgres database.
I modified the pg_hba.conf file to allow connections:
# "local" is for Unix domain socket connections only
local all all peer
# IPv4 local connections:
host all all 127.0.0.1/32 ident
# IPv6 local connections:
host all all ::1/128 ident
host all all 192.168.0.0/24 trust
host all all 0.0.0.0/0 md5
This is my iptables file:
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:8090
ACCEPT tcp -- anywhere anywhere state NEW tcp dpt:postgres
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
Now, when I connect from my host machine (ip: 192.168.0.117) to Postgres with the client pgAdmin3 (user: postgres, password: postgres) I am able to do that and everything works fine but PHP running on my CentOS VM can not connect to database:
$connection_string = "host=localhost port=5432 dbname=rt_prezzario user=postgres password=postgres";
$resource = pg_connect($connection_string);
This is the warning that PHP triggers when I run those two code lines:
Warning: pg_connect(): Unable to connect to PostgreSQL server: could not connect to server: Permission denied Is the server running on host "localhost" (::1) and accepting TCP/IP connections on port 5432?
Anyone have suggestions?
SELinux is likely blocking the connection. You should be able to find a log entry in /var/log/messages when the connection was blocked.
Try setting this flag in SELinux:
setsebool -P httpd_can_network_connect_db on
RedHat has some documentation on this SELinux flag: 1