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Cloud SQL Proxy error – An attempt was made to access a socket


Cloud SQL Proxy error – An attempt was made to access a socket
Are you trying to resolve Cloud SQL Proxy error? 

We can help you.


The Cloud SQL Auth proxy automatically encrypts traffic to and from the database using TLS 1.2 with a 128-bit AES cipher; SSL certificates are used to verify client and server identities.

Recently, one of our customers came across this error while trying to use Cloud SQL Proxy to configure access to Google Cloud SQL in Windows using the command:

cloud_sql_proxy.exe -dir=/cloudsql -instances=my-project:us-central1:sql-instance=tcp:3306 mysql -u –host

Here at Ibmi Media, as part of our Server Management Services, we regularly help our Customers to perform related Google Cloud queries.


Working with Cloud SQL Proxy error

Accessing your Cloud SQL instance using the Cloud SQL proxy offers the following advantages:

1. Secure connections: The Cloud SQL proxy automatically encrypts traffic to and from the database using TLS 1.2 with a 128-bit AES cipher; SSL certificates are used to verify client and server identities.

2. Easier connection management: The Cloud SQL proxy handles authentication with Cloud SQL, removing the need to provide static IP addresses.


Cloud SQL Proxy error looks like this:

listen tcp 127.0.0.1:3306: bind: An attempt was made to access a socket in a way forbidden by its access permissions.


The main causes of Cloud SQL Proxy error:

1. The SQL Server engages the 3306 port locally. Therefore, we cannot bind to it while it is running.

2. Another process might use Port 3306.


How to fix Cloud SQL Proxy error ?

To solve this issue, follow the steps given below.


1. Initially, we stop the SQL Server to bind the CloudSQL Proxy to it.

In case we have Windows 10, we go to Task Manager -> Services -> MySQL57. 

We have to right-click and stop the task.

Once done, we try and run the same command again.

Successful output will be as follows:

Listening on 127.0.0.1:3306 for <instance-name>

The same procedure is applicable to the postgresql process also.


2. Specify a different port, in case another process uses 3306.

For instance:

-instances=my-project:us-central1:sql-instance=tcp:3307


3. On Windows cmd or Google SDK shell, we use the below command:

cloud_sql_proxy.cmd -instances=<INSTANCE_CONNECTION_NAME>=tcp:3306 -credential_file=<PATH_TO_KEY_FILE>

Make sure to declare cloud_sql_proxy.cmd as environment variable, where:

i. INSTANCE_CONNECTION_NAME = my-project:us-central1:sql-instance

ii. PATH_TO_KEY_FILE = create a service account in IAM panel and save the json file copy its path and paste it here.


If this does not work, we try connecting to TCP 3307.


[Failed with the Cloud SQL Proxy error resolution? We'd be happy to further assist you. ]

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