Client Authentication failed with Server

Hi Folks,

We are running our code collaborator server over apache with reverse proxy configured.
Below are the configuration of reverse proxy in httpd.conf file

sever name :- devops.pun.ctdd.siemens.co.in

ProxyPass /collab http://localhost:9090/collab nocanon
ProxyPassReverse /collab http://localhost:9090/collab
ProxyPassReverse /collab http://devops.pun.ctdd.siemens.co.in/collab
RequestHeader set X-Forwarded-Proto "https"
RequestHeader set X-Forwarded-Port "443"

host url used for connecting is to the server from client
https://devops.pun.ctdd.siemens.co.in/collab/

Authectication failed with unknown error. Client unable to connect with the server