@mathieura
Maybe this has something to do with the script i used to install xo but i can not get v6 to be the default. The links going from v6 to v5 work but just defaults to v5 and accessing. i use port 443 for xo and i do use a proxy.
from the config.toml file
[http.mounts]
164 # Uncomment to setup a default version.
165 # Otherwise, XO5 will be the default for stable channel and XO6 for latest and source
166 # '/' = '../xo-web/dist/'
167
168 '/' = '../xo-web/dist/'
169 '/v6' = '../../@xen-orchestra/web/dist/'
170
171 [http.proxies]
172 # [port] is used to reuse the same port declared in [http.listen.0]
173 '/v5/api' = '[protocol]//localhost:[port]/api'
174 '/v5/api/updater' = 'ws://localhost:9001'
175 '/v5/rest' = 'http://localhost:[port]/rest'

this config breaks everything. Nothing works.
[http.mounts]
164 # Uncomment to setup a default version.
165 # Otherwise, XO5 will be the default for stable channel and XO6 for latest and source
166 # '/' = '../xo-web/dist/'
167
168 '/v6' = '../xo-web/dist/'
169 '/' = '../../@xen-orchestra/web/dist/'
170
171 [http.proxies]
172 # [port] is used to reuse the same port declared in [http.listen.0]
173 '/v5/api' = '[protocol]//localhost:[port]/api'
174 '/v5/api/updater' = 'ws://localhost:9001'
175 '/v5/rest' = 'http://localhost:[port]/rest'
Original config
[http.mounts]
164 # Uncomment to setup a default version.
165 # Otherwise, XO5 will be the default for stable channel and XO6 for latest and source
166 # '/' = '../xo-web/dist/'
167
168 '/v5' = '../xo-web/dist/'
169 '/v6' = '../../@xen-orchestra/web/dist/'
170
171 [http.proxies]
172 # [port] is used to reuse the same port declared in [http.listen.0]
173 '/v5/api' = '[protocol]//localhost:[port]/api'
174 '/v5/api/updater' = 'ws://localhost:9001'
175 '/v5/rest' = 'http://localhost:[port]/rest'