blank page directadmin 2222 admin interface

on a "pass to be migrated" server with centos 6 (i know it's not supported anymore ..) and v 1.643 directadmin, we have blank page (no login/password request showed)
after switching to debug mode, nothing special :

0: Accept-Encoding: gzip
1: Accept-Language: fr-FR,fr;q=0.9,en-US;q=0.8,en;q=0.7
2: Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
3: Cache-Control: max-age=0
4: Da-Ipc-Signature: dc04b5543856b93ffd2aa6a9083b5de8f2ce83fe
5: Da-Licc-Nresellers: -1
6: Da-Licc-Nusers: -1
7: Da-Licc-Vdomains: -1
8: Host: server1.xyz123.com:2222
9: Sec-Ch-Ua-Mobile: ?0
10: Sec-Ch-Ua-Platform: "Windows"
11: Sec-Ch-Ua: "Google Chrome";v="111", "Not(A:Brand";v="8", "Chromium";v="111"
12: Sec-Fetch-Dest: document
13: Sec-Fetch-Mode: navigate
14: Sec-Fetch-Site: none
15: Sec-Fetch-User: ?1
16: Upgrade-Insecure-Requests: 1
17: User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36
18: X-Da-Remote-Ip: 81.251.185.149
19: X-Forwarded-For: 81.251.185.149
didn't find the encrytped text
** incorrect login
Send::sendLogin(): not logged in. json_out=0
/assets/login.js
/assets/css/login.css
0: Accept-Encoding: gzip
1: Accept-Language: fr-FR,fr;q=0.9,en-US;q=0.8,en;q=0.7
2: Accept: */*
3: Da-Ipc-Signature: 5cb9dedb552795117b8db92ae3ea2fd2b8c43d93
4: Da-Licc-Nresellers: -1
0: Accept-Encoding: gzip
5: Da-Licc-Nusers: -1
1: Accept-Language: fr-FR,fr;q=0.9,en-US;q=0.8,en;q=0.7
6: Da-Licc-Vdomains: -1
2: Accept: text/css,*/*;q=0.1
7: Host: server1.xyz123.com:2222
3: Da-Ipc-Signature: a6e0a646d5a2c28465612aff0ea936d0d3288d0d
8: Referer: https://server1.xyz123.com:2222/
4: Da-Licc-Nresellers: -1
9: Sec-Ch-Ua-Mobile: ?0
5: Da-Licc-Nusers: -1
10: Sec-Ch-Ua-Platform: "Windows"
6: Da-Licc-Vdomains: -1
11: Sec-Ch-Ua: "Google Chrome";v="111", "Not(A:Brand";v="8", "Chromium";v="111"
7: Host: server1.xyz123.com:2222
12: Sec-Fetch-Dest: script
8: Referer: https://server1.xyz123.com:2222/
13: Sec-Fetch-Mode: no-cors
9: Sec-Ch-Ua-Mobile: ?0
14: Sec-Fetch-Site: same-origin
10: Sec-Ch-Ua-Platform: "Windows"
15: User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36
11: Sec-Ch-Ua: "Google Chrome";v="111", "Not(A:Brand";v="8", "Chromium";v="111"
16: X-Da-Remote-Ip: 81.251.185.149
12: Sec-Fetch-Dest: style
17: X-Forwarded-For: 81.251.185.149
13: Sec-Fetch-Mode: no-cors
14: Sec-Fetch-Site: same-origin
15: User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36
16: X-Da-Remote-Ip: 81.251.185.149
17: X-Forwarded-For: 81.251.185.149
didn't find the encrytped text
didn't find the encrytped text
Send::send_images(command='/assets/login.js' is_asset=1)
Send::send_images(command='/assets/css/login.css' is_asset=1)
Send::sendFail((null), (null)): json_override=0
Send::sendFail((null), (null)): json_override=0

is someone have an idea ? i tried to recopy skins from other server => same etc...

Thank you in advance,

Regards

Philippe