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ZNC 1.2 (OpenSSL 1.0.1e) + WebAdmin Module (SSL) doesn't work with EC PEM file (TLSv1.2-ECDH-ECDSA-AES256-GCM-SHA384-256bits) #272

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opened 2026-10-05 04:09:13 +02:00 by adam · 1 comment
adam commented 2026-10-05 04:09:13 +02:00
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The EC PEM file (TLSv1.2-ECDH-ECDSA-AES256-GCM-SHA384-256bits) works fine with ZNC but the WebAdmin (SSL) module doesn't work, the only way to solve this problem is replacing the PEM file to RSA (TLSv1.2-AES256-GCM-SHA384-256bits) that way will both work, the ZNC and the WebAdmin (SSL) module.

UPDATE:

FALSE ALARM!!!

The issue came from browser together with ZNC WebAdmin module, i use the same PEM file with other servers/softwares (webservers) and this issue does not happen whatever the browser used.

CHROME:
Error Code: ERR_SSL_VERSION_OR_CIPHER_MISMATCH

IE:
Doesn't open and it doesn't show any error

FIREFOX:
Works fine

The EC PEM file (TLSv1.2-ECDH-ECDSA-AES256-GCM-SHA384-256bits) works fine with ZNC but the WebAdmin (SSL) module doesn't work, the only way to solve this problem is replacing the PEM file to RSA (TLSv1.2-AES256-GCM-SHA384-256bits) that way will both work, the ZNC and the WebAdmin (SSL) module. # UPDATE: FALSE ALARM!!! The issue came from browser together with ZNC WebAdmin module, i use the same PEM file with other servers/softwares (webservers) and this issue does not happen whatever the browser used. CHROME: Error Code: ERR_SSL_VERSION_OR_CIPHER_MISMATCH IE: Doesn't open and it doesn't show any error FIREFOX: Works fine <!-- github-sync-id:22398800 -->
adam closed this issue 2026-10-05 04:09:13 +02:00
adam commented 2026-10-05 04:09:14 +02:00
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This report can be closed since the problem is not from ZNC but from ECDSA (opens fine with Firefox), keep up RSA to avoid problems with browsers.

This report can be closed since the problem is not from ZNC but from ECDSA (opens fine with Firefox), keep up RSA to avoid problems with browsers. <!-- github-comment-id:28327096 -->
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Reference: adam/znc#272