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https://issues.apache.org/jira/browse/GUACAMOLE-957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17034672#comment-17034672
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Robert Wolf commented on GUACAMOLE-957:
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Hello Mike,

in the version 1.0.0 I could write multiple hostnames and if I blocked the 
first server (using iptables -I OUTPUT -j REJECT -d SERVER1) guacamole has used 
the SERVER2. And same for SERVER3 if both SERVER1 and SERVER2 were inaccessible.

If this is not supported anymore, is there any other possibility to enter 
multiple LDAP servers?

Thank you.

> Support configuring multiple LDAP servers
> -----------------------------------------
>
>                 Key: GUACAMOLE-957
>                 URL: https://issues.apache.org/jira/browse/GUACAMOLE-957
>             Project: Guacamole
>          Issue Type: Improvement
>          Components: guacamole-auth-ldap
>    Affects Versions: 1.1.0
>            Reporter: Robert Wolf
>            Priority: Minor
>
> Hello,
> we have configured guacamole with postgresql (for configuration) and LDAP 
> (for authentication only) in version 1.0.0. The LDAP server are 3 Windows AD 
> servers.
> We have configured guacamole LDAP auth with {noformat}
> ldap-hostname: SERVER1 SERVER2 SERVER3
> {noformat}
> During authentication, guacamole connects to first server. If the connection 
> fails, it connectes to seconds server and if this connection fails to, it 
> connects to the third server. It works great in guacamole 1.0.0. But the 
> version 1.0.0 has problem with LDAP groups.
> So we have updated to 1.1.0. But in this configuration the multiple LDAP 
> hosts are incorrectly parsed and login does not work with "Invalid login" on 
> login page and following error message in the log {noformat}
> 13:21:24.339 [http-nio-8080-exec-16] ERROR o.a.g.a.ldap.LDAPConnectionService 
> - Binding with the LDAP server at "SERVER1 SERVER2 SERVER3" as user "bind-dn" 
> failed: ERR_04121_CANNOT_RESOLVE_HOSTNAME Cannot connect to the server, 
> Hostname 'SERVER1 SERVER2 SERVER3' could not be resolved.
> 13:21:24.340 [http-nio-8080-exec-16] ERROR 
> o.a.g.a.l.AuthenticationProviderService - Unable to bind using search DN 
> "bind-dn"
> 13:21:24.342 [http-nio-8080-exec-16] WARN  o.a.g.r.auth.AuthenticationService 
> - Authentication attempt from [10.0.48.1, 127.0.0.1] for user 
> "ad.user@domain" failed.
> {noformat}
> Could you verify this issue? Is there some other possible format for multiple 
> hostnames in *ldap-hostname* attribute? I have already tried to use "," 
> (comma) instead of space and to use LDAP URI format, but nothing works.
> Thank you for you answer.
> Regards,
> Robert Wolf.



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