I've created a MySQL In App database for my Azure App, and got the connection string for it. This string is injected into the application.json, and then used to create the actual connection:
WebApplicationBuilder builder = // get it somewhere
var connectionString = builder.Configuration.GetConnectionString("DefaultConnection")
builder.Services.AddDbContext<DatabaseContext>(options => options.UseMySQL(connectionString));
Only... no connection string works. The one with the port (Database=localdb;Data Source=127.0.0.1:53844;User Id=azure;Password=password) throws:
System.Net.Sockets.SocketException (11001): No such host is known.
And the one without the port (Database=localdb;Data Source=127.0.0.1;User Id=azure;Password=password) throws:
System.Net.Sockets.SocketException (10013): An attempt was made to access a socket in a way forbidden by its access permissions.
This question sugested another connection string (Server=127.0.0.1; Port=53844; Database=localdb; Uid=azure; Pwd=password), which weirdly enough also throws this exception, even though the port is defined:
System.Net.Sockets.SocketException (10013): An attempt was made to access a socket in a way forbidden by its access permissions.
And the manual suggests yet another string (server=localhost;database=localdb;user=azure;password=password) which again throws one of the two exceptions depending on if the port is present.
Connecting via the browser works fine, so I can confirm port, username and password work normally.
Just to be sure, I tried "localhost" as the host, too. Same results.
What am I doing wrong?
It's a mix out of all these connection strings:
server=localhost;port=53844;database=localdb;user=azure;password=password
(Port and server separated, but both present.)
Works for me right now.
Related
While connecting from my code outside of the company network, the Cosmos DB connection works just fine. But from the company network, it throws a 503 ServiceUnavailable status code. What are the possible issues?
Based on the comments:
System.Exception: 'Microsoft.Azure.Cosmos.CosmosException : Response status code does not indicate success: ServiceUnavailable (503); Substatus: 0;
ActivityId: ;
Reason: (The request failed because the client was unable to establish connections to 4 endpoints across 1 regions. Please check for client resource starvation issues and verify connectivity between client and server.
Normally, if you take that exception and store or view the ToString(), it will show you more information. But from the message itself, it means the client tried to connect to all known endpoints available and failed.
This normally means there is either something on the network blocking your request or the machine executing this code is completely overloaded (CPU at 100% or port exhaustion) and cannot process any request.
If this is consistently failing for all operations, check that your network has the correct port range open:
By default, the SDK works in Direct mode, so check that ports in the 10000 through 20000 range are open and available. If you have private endpoint enabled, the range is 0 to 65535.
As #GauravMantri mentioned, you can change to Gateway mode also if the network is restricted:
string connectionString = "<your-account-connection-string>";
CosmosClient client = new CosmosClient(connectionString,
new CosmosClientOptions
{
ConnectionMode = ConnectionMode.Gateway
});
I have a basic Pulsar app, and when I try to connect to Pulsar, I get this exception:
2021-03-10 14:38:26.107 WARN 7 --- [r-client-io-1-1]
o.a.pulsar.client.impl.ConnectionPool : Failed to open connection
to my-pulsar-server-ms-tls.domain.com:6651 :
io.netty.channel.ConnectTimeoutException: connection timed out:
my-pulsar-server-ms-tls.domain.com/10.80.13.38:6651 2021-03-10
14:38:26.212 WARN 7 --- [al-listener-3-1]
o.a.pulsar.client.impl.PulsarClientImpl : [topic:
persistent://myTenant/myNamespace/myTopic]
Could not get connection while getPartitionedTopicMetadata -- Will try
again in 100 ms
My Pulsar client is pretty basic:
PulsarClient.builder()
.serviceUrl(serviceUrl)
.authentication(AuthenticationFactory.token(authToken))
.tlsTrustCertsFilePath(serverCertificateFilePath.toString())
.enableTlsHostnameVerification(false)
.allowTlsInsecureConnection(false)
.build();
The producer is also pretty basic and looks like this:
pulsarClient.newProducer(Schema.STRING)
.topic(topic)
.create();
I've verified that the token and TLS cert are correct. I've also tried connecting a consumer from this same environment and got a similar exception, and I know that others with the same code are able to connect to the same Pulsar cluster from other environments. What is the issue?
Your connection is getting blocked by a firewall or network issue.
Verify that you can establish a connection to your endpoint my-pulsar-server-ms-tls.domain.com:6651 from your environment.
If you're able to run a network packet dump (like tcpdump), that should make it obvious if you're not able to establish a connection.
You can also try running curl my-pulsar-server-ms-tls.domain.com:6651, and if you get back some html, that means you were able to reach the server. However, if you get Could not resolve host, then you were blocked by the network configuration (such as a missing route) or firewall.
Change phppgadmin connection from adodb to php7.2-pgsql
Tried running an SQL query on database from phppgadmin and got error "Deprecated: The each() function is deprecated. This message will be suppressed on further calls in /usr/share/php/adodb/adodb-error.inc.php on line 114"
In my config.inc.php I don't see anything about defining a connection type
// Display name for the server on the login screen
$conf['servers'][0]['desc'] = 'PostgreSQL';
// Hostname or IP address for server. Use '' for UNIX domain socket.
// use 'localhost' for TCP/IP connection on this computer
$conf['servers'][0]['host'] = 'phppgadmin.com';
// Database port on server (5432 is the PostgreSQL default)
$conf['servers'][0]['port'] = 5432;
I would like to change the default connection from adodb to php7.2-pgsql
You need to run a newer version of phppgadmin with proper support for php7. I'd suggest just grabbing the code from git master at https://github.com/phppgadmin/phppgadmin
I want to import some data to Excel2016 from a postgresSQL table. I have tried it by clicking "new query" and selecting From Database -> From PostgresSQL Database:
But then I receive the following error:
Details: "TlsClientStream.ClientAlertException: CertificateUnknown: Server certificate was not accepted. Chain status: A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider.
. The specified hostname was not present in the certificate.
at TlsClientStream.TlsClientStream.ParseCertificateMessage(Byte[] buf, Int32& pos)
at TlsClientStream.TlsClientStream.TraverseHandshakeMessages()
at TlsClientStream.TlsClientStream.GetInitialHandshakeMessages(Boolean allowApplicationData)
at TlsClientStream.TlsClientStream.PerformInitialHandshake(String hostName, X509CertificateCollection clientCertificates, RemoteCertificateValidationCallback remoteCertificateValidationCallback, Boolean checkCertificateRevocation)"
Any suggestions on how to solve this? Thank you so much in advance!
This error is indicative of a connection being made to the PostgreSQL db where the server's certificate cannot be validated by the client making a connection. This error only happens when the "Trust Server Certificate" is set to FALSE in the library Excel uses to connect to PostgreSQL (npgsql).
There are several ways that may work to address this, in the order I'd suggest trying them:
If there's an option hidden in Excel (perhaps under advanced options or similar) to set the 'Trust Server Certificate' parameter to True, then your connection will start working. If it allows you to specify an entire connection string, then this can be done in the connection string as well.
The database should have a public key in an SSL cert listed in the postgresql.conf file for the db. If you (or your db administrator) can get that public key and add it to your machine (instructions will vary depending on your operating system).
I have finally found a workaround for my problem.
What you can do is to:
Install the current postgresql driver from here
Follow the instruction from this video
With this, you can connect to your postgreSQL database by ODBC.
We have been trying to use a SqlConnection within a TransactionScope. When we build the site and try this database call we run into an error:
A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host.)
The error involved occurs on the line cnn.Open().
using (var scope = new TransactionScope())
using (var cnn = new SqlConnection(connectionString))
{
cnn.Open();
int result = cnn.QuerySingle<int>("SELECT 1");
Console.WriteLine(result);
}
We created a console application to figure out what was wrong and discovered that by changing our connection string keyword 'Pooling' from 'false' to 'true' allows this to run in the console application and successfully return our result.
We made the same change to our site connection string, the same error as before returns.
Is there any reason this code is not working?
I was under the assumption that the web.config was law, as viewing the file through the Kudu service showed my expected connection string, but apparently this isn't the case in Azure.
I discovered that Azure Publish Profile is overriding our web.config connection string, this override still contained 'Pooling=false'.
Removing this now allows our code to run as intended.
This blog post explains more:
"When this code runs on a developer’s local machine, the value returned will be the one from the web.config file. However when this code runs in Windows Azure Web Sites, the value returned will instead be overridden with the value entered in the portal"