So the two general problem states that there is no deterministic way of knowing if the other party - to whom we communicate via a unreliable channel - has received our messages. This is quite analo...

I'm getting this exception randomly when trying to make https request, sometimes it works and sometimes failed to make handshaking with this exception. And I'm trying with lollipop and marshmallow....

Since 3 days I can't connect to the paypal sandbox. I found out that they maybe dissabled the support for SSLv3. So i tried to change the SSL Version in my curl Request by setting : curl_setopt($c...

If I run curl against a machine that is running OpenSSL 1.0.0e for example: curl -v https://shumaker.flexrentalsolutions.com on a machine that is running OpenSSL 0.9.8r I get the following error...

I've created my own private registry (private-registry) but I'm unable to push images to it. Than I get the following error: The push refers to a repository [private-registry:5000/ubuntu] (len: 1)...

I am now trying to set up Netty with a 2 way SSL handshake, where both the client and server present and verify certificates. This does not appear to be implemented in SslHandler. Has anyone does...

I am building an app where my phone frequently send data to my server. Since I would be using my mobile data, I was wondering how much data it cost to set up (and tear down?) a TCP connection to my...

DefaultHttpClient in Android 5.0 Lollipop seems to be broken. It can not set the connection to some sites that were successfully set by previous versions of Android. For example I try to connect t...

I have an issue with a windows server where an application pointing at a https end point fails with a: javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure. Actually it used...

In order to debug an nginx error case, I need to fully understand an error log message first. Our nginx writes the particular error log message from time to time. Log message "peer closed connec...

I'm seeing an SSL connection from a client running Java 6 fail with an exception like: Caused by: javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake at com.sun.ne...

I'm trying to use elephant.io to send event from my PHP script to my nodejs server. Performing tests with this library I've noticed that the handshake was not happening as expected. After reading ...

I'm doing a JBoss AS 5.1 to 7.4, and Java 6 to 7 migration, and get a handshake failure. The keystore and truststore are the ones we have been using successfully for ages with Java 6. I've writte...

I'm trying to determine the difference when I open serial port with hardware handshake and none handshake. It seems that in both cases I have to control RTS/CTS signals (just tested it with one CO...

TLDR I can't seem to connect to a https endpoint with a SoapClient. As my wget returns a handshake failure, I suspect that is the cause. How can I do a SOAP request to this server with PHP...

I use static HttpClient, and it works very slowly over https. I have added -Djavax.net.debug=ssl and found that handshaking is started for every https request again. looks like it can not reuse old...

I am stuck with a issue and trying to debug it. We purchased a Verisign certificate. When we use: openssl> s_client -connect myweb.com:443 -showcerts SSL Handshake never completes and at the ...

I am trying to learn about socket programming as well as the WebSocket protocol. I know that there are python web socket clients in existence but I am hoping to just build a toy version for my own ...

I'm new to Websockets and looking for working samples using WS and c# console application. I ran into this one, but i already have a problem. It seems that connection is closed when server sends a ...

I'm building a server with the ENC28J60 chip and a PIC18F4620. The chip is connected to my PC via ethernet. Currently, I'm trying to set up the TCP connection over which I'll build an HTTP connecti...

I'm working on a project that retrieves images from different servers (http and https). I found this usefull Q/A to avoid the problem of No peer certificate error in Android 2.3, but i can't under...

I've encountered a serious bug in OpenSSL 1.0.1 on Ubuntu 12.04: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=665452 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=666051 <- dated ...

I'm writing a server which is accepting incoming TCP connections. Let's suppose the server has accepted a TCP connection, and has already received 16 (or so) bytes from the client. Knowing those 16...

I'm connecting to a web service over HTTPS. I've done all that I think is required to make it work, but in the end I get a handshake failure. I found out that as a new user I can't post more than ...

Why does the TCP three-way handshake bump the sequence number when acking during the initial handshake? How is that better than just leaving the acknowledgement number equal to the sequence number?...