[openssl-users] Getting SSL_ERROR_SYSCALL for an incoming DTLS Connection on an existing DTLS Connection on the same port

Vineet Kumar Srivastava svineet at kodiakptt.com
Fri Jul 15 07:43:13 UTC 2016

  On an existing DTLS connection i.e. DTLS handshake already done successfully on port 5000 if server gets an incoming DTLS Connection i.e. DTLS Client Hello packet then SSL_read is generating SSL_ERROR_SYSCALL.
  Can anyone give me a clue as to why.
  Scenario is that Client had established a DTLS connection with server on port 5000 of server. IP address of client changes may be due to transition from Wi-Fi to 3G or vice-versa. So, now Client will again try to establish DTLS connection with server on same port 5000 of server.
  Please anyone let me know as to
Q1. why SSL_read is generating the error SSL_ERROR_SYSCALL and what can be done to proceed ?
Q2. Whether we can handle another incoming DTLS connection on an existing DTLS Connection on the same port without cleaning-up the already existing DTLS connection ?

Thanks in advance for the help,
Vineet Srivastava
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