Docker hub proxy with nginx revers

Hello, I’m trying to configure docker hub proxy.
What i’ve done:
create docker proxy
create repo connector http at port 8888
on nginx create server listen ssl at port 8443
attach certs
proxypass http://repo.sitename.ru:8888

and what i’ve got:
search work perfect
but when I’m trying to install something i’ve got this:

[root@master]# docker pull  repo.sitename.ru:8443/node
Using default tag: latest
Trying to pull repository repo.sitename.ru:8443/node ...
Get https://repo.sitename.ru:8443/v2/node/manifests/latest: Get https://repo.sitename.ru/v2/token?scope=repository%3Anode%3Apull&service=https%3A%2F%2Frepo.sitename.ru%2Fv2%2Ftoken: dial tcp ip:443: connect: no route to host
[root@master]#

so i’ve got strange request to obtain token on 443. and i cant understand why.
Cos same url but on right port gives token correctly
Any help?

Sonatype Nexus Repository ManagerOSS 3.22.1-02 (docker)