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Status Not under consideration
Workspace AIX
Created by Guest
Created on Aug 26, 2015

ssh login delay / timeout when primary dns-server is down

ssh login delay or timeout due to long hostsallowedlogin list when 1st DNS server is not available.

1) linux nslcd is using a filtered search by parameter in config:
“pam_authz_search (&(objectClass=posixAccount)(uid=$username)(|(host=$hostname)(host=$fqdn)(host=\\*)))”
as repaclement/enhancement for old param "pam_check_host_attr"

I don't know if this should/could be added to secldap or sshd for AIX, or if there are plans to port nslcd

2.) if the primary DNS doesn't reply, use the 2nd for subsequent
3.) use the round-robin-flag in /etc/resolv.conf (would be about 2x faster).

(2) implements, that the process doing the canonicals is getting all hostnames to be verified, opens one connection and does the verifications in same session.

Idea priority High
  • Guest
    Jun 13, 2017

    The DNS server rotation is working as design.
    Please feel free to reopen the issue if you disagree. Thanks.

  • Guest
    Aug 27, 2015

    Creating a new RFE based on Community RFE #76131 in product IBM AIX.

  • Guest
    Aug 26, 2015

    Attachment (Description): original DCR MR0825155235 ssh login delay due to long hostsallowedlogin list when 1st DNS server is not available