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Client connect causes "error:140760FC:SSL routines:SSL23_GET_CLIENT_HELLO:unknown protocol" #543

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opened 2026-10-05 04:28:50 +02:00 by adam · 6 comments
adam commented 2026-10-05 04:28:50 +02:00
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Hello,

since some days or maybe weeks I can't connect to my znc instance on my server.
I am using ZNC 1.6.0-2 on Ubuntu 15.04 with Kernel Version 3.19.0-22-generic.
Used Clients: xchat and mirc

When I start ZNC in debug mode the connection to the IRC networks is working fine, all of my clients can't connect.

[2015-07-24 03:36:35.361684] _LISTENER == ConnectionFrom(2a02:908:f460:9da0:642a:27dd:b2ff:2c12, 5255) [Allowed]
[2015-07-24 03:36:35.361781] There are [0] clients from [2a02:908:f460:9da0:642a:27dd:b2ff:2c12]
[2015-07-24 03:36:35.383654] src/Csocket.cpp:602 at src/Csocket.cpp:3325
[2015-07-24 03:36:35.383772] src/Csocket.cpp:607 error:140760FC:SSL routines:SSL23_GET_CLIENT_HELLO:unknown protocol
[2015-07-24 03:36:38.449695] _LISTENER == ConnectionFrom(37.201.192.88, 13045) [Allowed]
[2015-07-24 03:36:38.449801] There are [0] clients from [37.201.192.88]
[2015-07-24 03:36:38.474327] src/Csocket.cpp:602 at src/Csocket.cpp:3325
[2015-07-24 03:36:38.474435] src/Csocket.cpp:607 error:140760FC:SSL routines:SSL23_GET_CLIENT_HELLO:unknown protocol
.....

I unfortunaly have no idea why the issue suddenly appeared. In the past it was working fine. I am pretty sure SSL/TLS is the problem because when I connect without it everything works fine.

In my configuration file:

SSLCertFile = /etc/znc/znc.pem

and

<Listener listener0>
        AllowIRC = true
        AllowWeb = true
        IPv4 = true
        IPv6 = true
        Port = 1025
        SSL = true
        URIPrefix = /
</Listener>

I removed the znc.pem file and restarted znc to generate a new file. Unfortunaly this did not solve my problem.

Well, thank you for reading this. I hope somebody can help me :)

Regards,

Richard

Hello, since some days or maybe weeks I can't connect to my znc instance on my server. I am using ZNC 1.6.0-2 on Ubuntu 15.04 with Kernel Version 3.19.0-22-generic. Used Clients: xchat and mirc When I start ZNC in debug mode the connection to the IRC networks is working fine, all of my clients can't connect. ``` [2015-07-24 03:36:35.361684] _LISTENER == ConnectionFrom(2a02:908:f460:9da0:642a:27dd:b2ff:2c12, 5255) [Allowed] [2015-07-24 03:36:35.361781] There are [0] clients from [2a02:908:f460:9da0:642a:27dd:b2ff:2c12] [2015-07-24 03:36:35.383654] src/Csocket.cpp:602 at src/Csocket.cpp:3325 [2015-07-24 03:36:35.383772] src/Csocket.cpp:607 error:140760FC:SSL routines:SSL23_GET_CLIENT_HELLO:unknown protocol [2015-07-24 03:36:38.449695] _LISTENER == ConnectionFrom(37.201.192.88, 13045) [Allowed] [2015-07-24 03:36:38.449801] There are [0] clients from [37.201.192.88] [2015-07-24 03:36:38.474327] src/Csocket.cpp:602 at src/Csocket.cpp:3325 [2015-07-24 03:36:38.474435] src/Csocket.cpp:607 error:140760FC:SSL routines:SSL23_GET_CLIENT_HELLO:unknown protocol ..... ``` I unfortunaly have no idea why the issue suddenly appeared. In the past it was working fine. I am pretty sure SSL/TLS is the problem because when I connect without it everything works fine. In my configuration file: ``` SSLCertFile = /etc/znc/znc.pem ``` and ``` <Listener listener0> AllowIRC = true AllowWeb = true IPv4 = true IPv6 = true Port = 1025 SSL = true URIPrefix = / </Listener> ``` I removed the znc.pem file and restarted znc to generate a new file. Unfortunaly this did not solve my problem. Well, thank you for reading this. I hope somebody can help me :) Regards, Richard <!-- github-sync-id:96943502 -->
adam closed this issue 2026-10-05 04:28:50 +02:00
adam commented 2026-10-05 04:28:51 +02:00
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What does mIRC print with this command?
//echo -ag $os $version $sslready
And what is your /server line you are using in mIRC?

What does mIRC print with this command? `//echo -ag $os $version $sslready` And what is your `/server` line you are using in mIRC? <!-- github-comment-id:124291674 -->
adam commented 2026-10-05 04:28:52 +02:00
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xchat is outdated and does not support modern TLS versions, upgrade to hexchat for that.

xchat is outdated and does not support modern TLS versions, upgrade to hexchat for that. <!-- github-comment-id:124293109 -->
adam commented 2026-10-05 04:28:52 +02:00
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@TingPing that doesn't solve the mIRC issue. It does solve the XChat problem.

@TingPing that doesn't solve the mIRC issue. It does solve the XChat problem. <!-- github-comment-id:124293192 -->
adam commented 2026-10-05 04:28:53 +02:00
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@KindOne-
My operating Windows 8.1 with mIRC 7.42.
I can't see an output for the /server line. The SSL options are very limited but "Display invalid certificates for approval" is checked.

@All
I installed HexChat and the connection is working. It is necessary to check "Accept invalid certificates", but thats no issue.

Personally I need a windows-gui, a linux-gui and a linux-cli client.
hexchat and irssi (which is also working btw) are fullfilling my needs.

I am happy now, but does somebody have an idea why the behavior suddenly changed?

An update of some TLS-libraries is the only reason I can imagine. My apt log is showing that my ssl libraries are updated from time to time.
I will be available to try stuff if necessary.

And thank you for your fast answers.

@KindOne- My operating Windows 8.1 with mIRC 7.42. I can't see an output for the /server line. The SSL options are very limited but "Display invalid certificates for approval" is checked. @All I installed HexChat and the connection is working. It is necessary to check "Accept invalid certificates", but thats no issue. Personally I need a windows-gui, a linux-gui and a linux-cli client. hexchat and irssi (which is also working btw) are fullfilling my needs. I am happy now, but does somebody have an idea why the behavior suddenly changed? An update of some TLS-libraries is the only reason I can imagine. My apt log is showing that my ssl libraries are updated from time to time. I will be available to try stuff if necessary. And thank you for your fast answers. <!-- github-comment-id:124298824 -->
adam commented 2026-10-05 04:28:54 +02:00
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@DonRichie Well, mIRC 7.42 has builtin ssl/tls support, so you are doing something wrong on your end. Just from looking at your paste and figuring stuff out, I managed to connect to your znc with my mIRC with /server your_znc_ip_address_here:+1025. I have my mIRC set to "Automatically accept invalid certs".

@DonRichie Well, mIRC 7.42 has builtin ssl/tls support, so you are doing something wrong on your end. Just from looking at your paste and figuring stuff out, I managed to connect to your znc with my mIRC with `/server your_znc_ip_address_here:+1025`. I have my mIRC set to "Automatically accept invalid certs". <!-- github-comment-id:124300442 -->
adam commented 2026-10-05 04:28:54 +02:00
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@KindOne-
After reinstalling and reconfiguring my mirc I was also able to connect. I don't know why but okay. It was in fact an issue on my side.

Will close the issue now. Thank you very much

@KindOne- After reinstalling and reconfiguring my mirc I was also able to connect. I don't know why but okay. It was in fact an issue on my side. Will close the issue now. Thank you very much <!-- github-comment-id:124304370 -->
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Reference: adam/znc#543