This is not exactly the right place to post this message, but I reckon it is close enough.
A year or so ago, I wrote up a guide for configuring a Postfix client to use Kerb/GSSAPI to authenticate against a Postfix server acting as a relay. The guide is here: https://stomp.colorado.edu/blog/blog/2013/07/09/on-freeipa-postfix-and-a-relaying-smtp-client/ and it is linked somewhere on the FreeIPA pages. It was written for RHEL 6.x Everything worked fine and I forgot everything I ever learned to write the guide :). With the release of RHEL 7 I am again going back through the process of validating that things work as I believe they should etc. Trying to configure up this same setup with RHEL 7 is however, proving to be problematic. The configuration directives have not changed and everything should in theory work, however it simply doesn't. My basic layout is as follows, RHEL 7 Postfix client attempting to relay through a RHEL 6 Postfix server using Kerberos. SASL appears to be bailing when attempting to use GSSAPI for auth with the Postfix server. The specific error is: warning: SASL authentication failure: GSSAPI Error: A required input parameter could not be read (Unknown error) Which means all of nothing to me. However, I found the following bug in Cyrus' bugzilla: https://bugzilla.cyrusimap.org/show_bug.cgi?id=3480 Essentially mentioning the same thing, and mentioning that this error is cropping up in a few places (autofs is mentioned). The specific commit they reference is here: http://git.cyrusimap.org/cyrus-sasl/commit/?id=080e51c7fa0421eb2f0210d34cf0ac48a228b1e9 I don't know whether this is an incompatibility, I don't know whether running against a RHEL 7 Postfix server will help in any way. I actually don't know much of anything about this, and hence wanted to ask for thoughts from folks who may be more in the know than I am. Any ideas what this is all about? Any thoughts about possible solutions? -Erinn
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