While PLAIN authentication works fine, I had the https daemon crash during 
DIGEST-MD5 authentication.  The crash turned out to be a divide error in 
libdigestmd5 from cyrus-sasl.  In particular (in cyrus-sasl’s 
plugins/digestmd5.c):

  /* Create an initial cache entry for non-persistent HTTP connections */
  unsigned val = hash((char *) nonce) % text->reauth->size;

would fail due to text->reauth->size being zero.  If I’m reading this 
correctly, this appears to be the effect of initializing the plugin (as done in 
digestmd5_server_plug_init(), defined in same file as the snippet above) with 
an undefined reauth_timeout.  And indeed, adding "sasl_reauth_timeout: 10” to 
/etc/imapd.conf makes the crash go away.

I didn’t expect a configuration without reauth_timeout to crash imapd, but I 
haven’t done enough research to be sure, nor to tell where the problem lies 
should this be a real issue.  Any further insight is greatly appreciated!

// Cheers; Johan

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