After update Carbonio CE 23.3.0 to 23.4.0 SpnegoAuthServlet not supported - Install & Setup https://community.zextras.com/forum/carbonio-setup/after-update-carbonio-ce-23-3-0-to-23-4-0-spnegoauthservlet-not-supported/ Zextras Community Discussion Board en-US Tue, 08 Sep 2026 01:03:08 +0000 wpForo 60 RE: After update Carbonio CE 23.3.0 to 23.4.0 SpnegoAuthServlet not supported https://community.zextras.com/forum/carbonio-setup/after-update-carbonio-ce-23-3-0-to-23-4-0-spnegoauthservlet-not-supported/#post-5943 Wed, 04 Oct 2023 09:02:16 +0000 I've just installed CE 23.9.0 and got the same issue.

I've managed to configure all other services to use kerberos ( direct imap 7143, proxy imap 143, smtp 587) but only can't run it on web client.

How to enable debug of spnego?

Keys from here https://github.com/zextras/carbonio-mailbox/blob/main/store/docs/spnego.txt#L454-L461 do not improve logs.

]]> Install & Setup Andrey https://community.zextras.com/forum/carbonio-setup/after-update-carbonio-ce-23-3-0-to-23-4-0-spnegoauthservlet-not-supported/#post-5943 After update Carbonio CE 23.3.0 to 23.4.0 SpnegoAuthServlet not supported https://community.zextras.com/forum/carbonio-setup/after-update-carbonio-ce-23-3-0-to-23-4-0-spnegoauthservlet-not-supported/#post-4938 Fri, 12 May 2023 07:54:10 +0000 Hello All,

after updating Carbonio CE 23.3.0 to 23.4.0 SPNEGO stopped working. On page /service/spnego/snoop.jsp and /service/spnego/ show

HTTP ERROR 403 system failure: not supported

URI: /service/spnego/
STATUS: 403
MESSAGE: system failure: not supported
SERVLET: SpnegoAuthServlet

in /opt/zextras/log/mailbox.log

2023-05-12 09:56:43,767 INFO account - spnego auth failed: system failure: not supported

]]> Install & Setup lexennov https://community.zextras.com/forum/carbonio-setup/after-update-carbonio-ce-23-3-0-to-23-4-0-spnegoauthservlet-not-supported/#post-4938