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2
votes
0answers
382 views

The command “hdfs dfsadmin -report” fails because “failed to connect to server”

I am trying to configure a multi-node cluster of open source Hadoop. I have Hadoop 3.0 installed on the namenode and the data node. Both are running Linux (SUSE and Ubuntu). None are CentOS, RedHat ...
1
vote
2answers
183 views

Java refuses to listen on IPv6 on Turnkey

so i am using MineOS, a turnkey with preinstalled node.js webUI for deploying Minecraftservers. Now i want the server to be reachable via IPv6, because thats all i get from my ISP. But my server ...
2
votes
0answers
1k views

TCP SYN,ACK Retransmissions

The following network trace was recorded on a Raspberry PI running Debian Linux. It seems the Raspberry is not seeing the data packet #36995 for some reason; it is just stupidly repeating his SYN,ACK ...
0
votes
1answer
583 views

What happens to TCP when a write fails to enqueue with the device tx ring?

Lets say the device tx ring is full and you do a normal C non blocking write(fd, buff) to enqueue data in the TCP SND buffer. What happens when this fails? In UDP - the packet would be dropped but ...
1
vote
2answers
7k views

Java Client Connection Refused by Linux Server

I have a Java server and client, which is a simple server that prints a message when the client communicates with it. It works perfectly fine when the client and server are on the same machine. When I ...
3
votes
1answer
924 views

Allow non-root unmodifiable sofware to bind to ports 80 & 443

The company I'm in uses the Java Secure Application Manager to "secure" non-internal connections their webmail and electronic collaboration software. Aside from using expired certificates, and ...
2
votes
1answer
71 views

Can connect from RPi to laptop, but not other way around

I'm developing a server-client application (command-line based) in Java. I want to run it on my Raspberry Pi (RPi), but it turns out I can't login to my server-part from my laptop. The problem is that ...
1
vote
0answers
400 views

Parameters of optimization TCP / IP in Linux Mandriva

In the registry of Windows XP can find the following options to enable optimizations for TCP/ IP: - MSS; - TCP Rx Window Size; - SACK (Selective Acknowledgment); - ECN (Explicit Congestion ...