LDAP / eldap error: Correct multiple ldap_uids format / Domain component?

[hvostat]

Hello dear eJabberD team,
I can not solve the issue by myself so I would like to ask for some help.

My environment:

• ejabberd version: 25.04
• OS: Linux (Debian 12, Docker v.20.10.24)
• Installed from: ghcr.io/processone/ejabberd:25:04

Configuration

[...]
auth_method: [ldap]
ldap_servers:
  - "ldap.domain.de"
ldap_encrypt: none

ldap_base: "o=company,c=de"
ldap_filter: "(|(client_type=AAA)(mailType=BBB)(client_type=CCC))"

ldap_rootdn: "cn=aaa,ou=services,o=domain,c=de"
ldap_password: "**********"

ldap_uids:
  "mail": "%u@domain.de"
[...]

Overvew

After upgrading EJD to v.24.04 from v.18 the format of the LDAP configuration has changed.

The first issue I have encountered was solved:
#3065

Unfortunately right after start Ejabbed start to flood with tons of errors then crashes:

2026-02-05T00:08:27.820029+00:00 error: FORMATTER CRASH: {report,#{label => {erl_prim_loader,file_error},report => "File operation error: emfile. Target: ./erl_posix_msg.beam. Function: read_file. Process: code_server."}}

2026-02-05T00:08:27.820338+00:00 error: FORMATTER CRASH: {report,#{args => ['eldap_#Ref<0.2172095014.1369178119.122311>',timeout,connecting,{eldap,3,[<<"ldap.domain.de">>],undefined,389,gen_tcp,none,[{verify,verify_none}],undefined,<<"cn=mail,ou=services,o=domain,c=de">>,<<"*******">>,0,#Ref<0.2172095014.1369178119.122313>,{dict,0,16,16,8,80,48,{[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]},{{[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]}}},{[],[]}},{undef,[{erl_posix_msg,message,[emfile],[]},{eldap,format_error,2,[{file,"src/eldap.erl"},{line,1136}]},{eldap,connect_bind,1,[{file,"src/eldap.erl"},{line,1093}]},{eldap,connecting,2,[{file,"src/eldap.erl"},{line,620}]},{p1_fsm,handle_msg,10,[{file,"/ejabberd/deps/p1_utils/src/p1_fsm.erl"},{line,582}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,329}]}]}],label => {error_logger,error_msg},format => "** State machine ~p terminating \n** Last event in was ~p~n** When State == ~p~n**      Data  == ~p~n** Reason for termination = ~n** ~p~n"}}

2026-02-05T00:08:27.862728+00:00 error: FORMATTER CRASH: {report,#{label => {erl_prim_loader,file_error},report => "File operation error: emfile. Target: /opt/ejabberd-25.04/lib/elixir-1.18.3/ebin/Elixir.Inspect.Algebra.beam. Function: read_file. Process: eldap_#Ref<0.2172095014.1369178119.122919>."}}

Question 1

What can I do with the bug above?

Obv, I have successfully tested the LDAP connection before starting Ejabberd.

(Ejabberd v.18 runs without any problems.)

Question 2

The old ldap_uids config looked like this:

[...]
ldap_uids: 
  - "mail": "%u@%d"
  - "aliase": "%u@%d"
[...]

What's the correct way now to config the ability for users to be able to:

• authenticate by BOTH primary email and the alias
• use several domains (that's why we are using the %d variable, but I can not see it now in the documentation)

Many thanks in advance!

Best,
Den