I'm asking you a question because I need your help.
I have built a redis server in a docker container and am using it in cluster mode.
I can access the redis server and ping well.
However, when executing the get/set command, the following error message is output and the connection with the redis is lost.
Could not connect to Redis at 172.19.0.4:6300: Connection failed due to no response from the connected member or connection was lost due to no response from the host.
I would really appreciate it if you could help me with the above problem.
I guessed that the connection and ping were done well, so it was a security-related configuration problem.
So I tried to set the security setting of the redis.conf file to no, but the problem was not solved.
'protected-mode no'
Related
While trying to connect to SQLAnywhere (Sybase) database (C# code) from Azure ServiceFabric:
await using var connection = new SAConnection(connectionString);
await connection.OpenAsync();
receive iAnywhere.Data.SQLAnywhere.SAException
Connection error: Connection was dropped (may not be a SQL Anywhere server)
Error code is Error 832. This is generic connection error: An error occurred while attempting to establish a connection with the database server, but before attempting to connect to a database. Failure to initialize a communication link during the connection attempt is an example of this error. Creating a debug log file using the LogFile connection parameter may provide more information.
Locally it works, but does not work from Service Fabric.
Fix ideas tried:
Missing driver? Looks like no, Sybase (now SAP) SQLAnywhere requires special driver or client - but locally also works without this driver, just with iAnywhere.Data.SQLAnywhere.NETCore nupackage installed
Network connection/ firewall problems? Looks like no, database server can be pinged from Service Fabric node
It was another traffic protection tool. Although it was possible to telnet the port, still traffic from app was blocked by another tool.
Had a similar issue - turned out that whilst standard incoming traffic from the Sybase Server had been whitelisted in our Firewall, encrypted traffic from this had not been.
This meant I could ping and connect with Telnet, but got the same error when trying to log-in with my credentials
Connection error: Connection was dropped (may not be a SQL Anywhere server)
Our comms team solved the issue by whitelisted encrypted traffic from the server address as well. They also mentioned it possibly could have been solved we shared a valid security certificate for the encrypted data with their team, but were happy with the first course of action.
we operate CENM(1.2 and use helm template to run on k8s cluster) to construct our own private network and keep on running CENM network map server for a few week, then launching new node start failing.
with further investigation, its appeared that request timeout for http://nmap:10000/network-map causes problem.
in nmap server’s log, we found following output when access to above url with curl.
[NMServer] - Error while handling socket client message com.r3.enm.servicesapi.networkmap.handlers.LatestUnsignedNetworkParametersRetrievalMessage#760c53ea: HikariPool-1 - Connection is not available, request timed out after 30000ms.
netstat shows there is at least 3 establish connection to the database from the container which network map server runs, also I can connect database directly with using CLI.
so I don’t think it is neither database saturated nor network configuration problem.
anyone have an idea why this happens? I think restart probably solve the problem, but want to know the root cause...
regards,
Please test the following options.
Since it is the HikariCP (connection pool) component that is throwing the error it would be worth seeing if increasing the pool size in the network map configuration may help - see below)
Corda uses Hikari Pool for creating the connection pool. To configure the connection pool any custom properties can be set in the dataSourceProperties section.
dataSourceProperties = {
dataSourceClassName = "org.postgresql.ds.PGSimpleDataSource"
...
maximumPoolSize = 10
connectionTimeout = 50000
}
Has a healthcheck been conducted to verify there are sufficient resources on that postgres database i.e basic diagnostic checks ?
Another option to get more information logged from the network map service is to run with TRACE logging also:
From https://docs.corda.net/docs/cenm/1.2/troubleshooting-common-issues.html
Enabling debug/trace logging
Each service can be configured to run with a deeper log level via command line flags passed at startup:
java -DdefaultLogLevel=TRACE -DconsoleLogLevel=TRACE -jar <enm-service-jar>.jar --config-fi
I am using Perforce as part of a small development team. Everyone was able to connect to the P4V client except for one person who gets the following error:
TCP receive failed.
read: socket: WSAECONNRESET
We have deactivated his McAfee firewall and virus scan, but the error persists. I really don't know what to do with this error and it seems to be rather undocumented on the perforce website. From what I gather, it's because it's not a perforce-specific issue, but rather a TCP communication problem that might be caused by something else.
Any tips?
a TCP communication problem that might be caused by something else.
This is possible, or it's possible that whenever this user connects it causes some sort of server fault.
https://msdn.microsoft.com/en-us/library/ms740668.aspx
WSAECONNRESET 10054 Connection reset by peer.
An existing connection was forcibly closed by the remote host. This normally results if the peer application on the remote host is suddenly stopped, the host is rebooted, the host or remote network interface is disabled, or the remote host uses a hard close (see setsockopt for more information on the SO_LINGER option on the remote socket). This error may also result if a connection was broken due to keep-alive activity detecting a failure while one or more operations are in progress. Operations that were in progress fail with WSAENETRESET. Subsequent operations fail with WSAECONNRESET.
Beyond the usual connection troubleshooting questions (is this user on the same subnet? same version of the client software? same exact P4PORT setting? is the user able to connect via the command line client and if not does it give a more helpful error? why is this user unlike all other users?) I'd look at the server logs to see if it's logging any sort of more helpful error when this user tries to connect.
I will get the error below randomly when I'm running an asp.net application I am working on. Usually it will happen ever 3 days or so and I am forced to restart my machine to fix it but it's been getting worse and now a reboot dosn't seem to fix anything. I'm running the application on my machine and doing a lot of debugging. All interactions with the db are done through linq to sql. The db is on another server that I am connecting to. Has anyone run into this before? Any suggestions?
A network-related or instance-specific
error occurred while establishing a
connection to SQL Server. The server
was not found or was not accessible.
Verify that the instance name is
correct and that SQL Server is
configured to allow remote
connections. (provider: TCP Provider,
error: 0 - No such host is known.)
It may be DNS, try to use some different DNS addresses. :)
I've seen similar before but it was related to a faulty network card that was dropping packets. Have you had any other strange network problems?
In your connection string to the db is the host entered as a hostname or an IP address. If by name try swapping to its IP address instead. This won't solve the underlying problem by may workaround it for you.
Edit
Also have a look at this SO answer here. Are you leaving connections open/orphaning them? That would ring true with the disconnect happening at regular time intervals..
I have this error which happen many times on my site:
"A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full.)"
My site files are on a server and the database on another server, but on the same network.
Anyone know what may cause this problem and how to solve?
Notes:
- When i restart the website server the problem solve and everything work fine.
- Sure my sql server allow remote connections from this website server
It's a pretty generic error when the application can't get to the database. Perhaps you are leaving connections open after using them? There could be a limit on the amount of concurrent connections by user or server.
It's a networking error of some kind, or you're specifying the instance name incorrectly. I've recently seen both cases. In one case, I had moved a connection string from one system, to another system that had a different instance name installed. In another case, I had a server running in a Virtual Machine - about ten minutes after the machine was resumed from suspension, the machine would lose its DHCP lease (and therefore its connectivity).
It could be just about anything, and you'll have to go find out, perhaps by using a network monitor program like Microsoft Network Monitor 3.2.
I found a good article talking about this error, i think it shows the real reason
Understanding the error “An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full.”