topic Re: SSL: WRONG_VERSION_NUMBER when sending email in Splunk Enterprise

SSL: WRONG_VERSION_NUMBER when sending email

gbennett111 — Tue, 29 Sep 2020 23:17:43 GMT

HI,

I am getting the following error when trying to send an email

command="sendemail", [SSL: WRONG_VERSION_NUMBER] wrong version number (_ssl.c:741) while sending mail to

using the command
index=_internal | head 1 | sendemail to="my email" from="domain email" format="html" server=smtp-relay.gmail.com:587 use_ssl=1

How can I fix this error?

Thanks

Re: SSL: WRONG_VERSION_NUMBER when sending email

skalliger — Tue, 19 Feb 2019 12:30:41 GMT

Hey,

take a look at the known issues. Search for SPL-138647, hope this helps.

Skalli

Re: SSL: WRONG_VERSION_NUMBER when sending email

gbennett111 — Tue, 29 Sep 2020 23:23:11 GMT

Thanks Skalli,

After applying the config change and adding
[email]
sslVersions = *,-ssl2
cipherSuite = TLSv1+HIGH:TLSv1.2+HIGH:@STRENGTH

Got rid of that error now getting
command="sendemail", [SSL: UNKNOWN_PROTOCOL] unknown protocol (_ssl.c:741)

Running the below command returns the following

sudo ./splunk/bin/splunk cmd openssl s_client -connect smtp-relay.gmail.com:587 | awk '/Protocol/ || /Cipher/ || /Verify/'
140005157344960:error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol:s23_clnt.c:827:
New, (NONE), Cipher is (NONE)
Protocol : TLSv1.2
Cipher : 0000
Verify return code: 0 (ok)

The server has other applications successfully sending emails via the above mail server so I am missing something in the config.

Re: SSL: WRONG_VERSION_NUMBER when sending email

skalliger — Wed, 20 Feb 2019 08:29:34 GMT

Hm, this seems weird. Are you using a certificate of your own CA (or Let's Encrypt)? Can you test that certificate (validate) and check if it's in the correct format? If you can not connct wiht openssl to that server, it's the certificate.

Skalli

Re: SSL: WRONG_VERSION_NUMBER when sending email

gbennett111 — Wed, 20 Feb 2019 21:42:13 GMT

Hi Skalli,

It's not our certificate it's Google's certificate and as stated we have other applications installed (Jira, Confluence) that can successfully connect and send emails via the same mail server.

I am at a loss as well as I do not know why one application is working correctly and another is not. I may have to try a different mail server and see how I go.

Thanks.

Re: SSL: WRONG_VERSION_NUMBER when sending email

amandeepsingh — Mon, 19 Jul 2021 18:09:02 GMT

Try to use default port 465 not 587