New universal forwarder won’t connect to another forwarder

Error on the sender end’s ($SPLUNK_HOME/var/log/splunk/splunkd.log)

02-18-2015 12:32:06.160 +1000 ERROR TcpOutputFd - Read error. Connection reset by peer

Error on the receive end’s ($SPLUNK_HOME/var/log/splunk/splunkd.log)

02-18-2015 12:31:14.423 +1000 ERROR TcpInputProc - Error encountered for connection from src=senderip:47960. error:140760FC:SSL routines:SSL23_GET_CLIENT_HELLO:unknown protocol

I checked the certificate to make sure the common name is right:

sudo openssl x509 -text -noout -in $SPLUNK_HOME/etc/auth/mycerts/sender.pem | grep Subj
Subject: C=AU, ST=Queensland, L=Brisbane, O=sender, OU=Company,

/opt/splunkforwarder/etc$ sudo grep -i sender * -R

etc/system/local/server.conf:serverName = sender
etc/system/local/inputs.conf:host = sender
etc/system/local/outputs.conf:sslCertPath = $SPLUNK_HOME/etc/auth/mycerts/sender.pem

So, the common name on the certificate is different to the name presented by the server. I reissued the cert for the new server name, restart, still no no good.

02-18-2015 12:44:44.163 +1000 ERROR TcpInputProc - Error encountered for connection from src=sender:47997. error:140760FC:SSL routines:SSL23_GET_CLIENT_HELLO:unknown protocol

This was in the logs on the sender’s end:

02-18-2015 12:48:19.271 +1000 ERROR TcpOutputProc - Error initializing SSL context - invalid sslCertPath for server

Turns out, the CAcert was wrong. It presents as a “file not found” error, but it’s just a file that doesn’t work. It needs to include both certs from the chain, which is different to how the chain’s exported from the windows CA server normally.

Once I fixed that, all good:

02-18-2015 12:53:09.862 +1000 INFO TcpOutputProc - Connected to using ACK.

Sometimes it pays to check both logs 🙂

#Certificates #Linux #Splunk #SSL