No web socket connection happening when click on terminal. just cursor blinks and no prompt

POD running on openshift 4.5 any idea?
any suggestion is appreciated

[D 2021-04-15 22:56:32.437 SingleUserNotebookApp auth:743] Setting oauth cookie for ::ffff:10.130.2.1: jupyterhub-user-user%20abc, {‘path’: ‘/user/user%20abc/’, ‘httponly’: True}
[I 2021-04-15 22:56:32.438 SingleUserNotebookApp log:181] 200 GET /user/user%20abc/api/sessions?1618527391900 (user abc@::ffff:10.130.2.1) 1.99ms
[D 2021-04-15 22:56:32.442 SingleUserNotebookApp auth:860] Allowing Hub admin user abc
[D 2021-04-15 22:56:32.442 SingleUserNotebookApp auth:743] Setting oauth cookie for ::ffff:10.130.2.1: jupyterhub-user-user%20abc, {‘path’: ‘/user/user%20abc/’, ‘httponly’: True}
[I 2021-04-15 22:56:32.444 SingleUserNotebookApp log:181] 200 GET /user/user%20abc/api/terminals?1618527391906 (user abc@::ffff:10.130.2.1) 1.76ms
[D 2021-04-15 22:56:36.037 SingleUserNotebookApp auth:860] Allowing Hub admin user abc
[D 2021-04-15 22:56:36.037 SingleUserNotebookApp auth:743] Setting oauth cookie for ::ffff:10.130.2.1: jupyterhub-user-user%20abc, {‘path’: ‘/user/user%20abc/’, ‘httponly’: True}
[I 2021-04-15 22:56:36.040 SingleUserNotebookApp log:181] 200 GET /user/user%20abc/api/contents?content=1&1618527395926 (user abc@::ffff:10.130.2.1) 3.61ms
[D 2021-04-15 22:56:36.294 SingleUserNotebookApp auth:860] Allowing Hub admin user abc
[D 2021-04-15 22:56:36.294 SingleUserNotebookApp auth:743] Setting oauth cookie for ::ffff:10.130.2.1: jupyterhub-user-user%20abc, {‘path’: ‘/user/user%20abc/’, ‘httponly’: True}
[I 2021-04-15 22:56:37.000 SingleUserNotebookApp management:344] New terminal with automatic name: 3
[I 2021-04-15 22:56:37.003 SingleUserNotebookApp log:181] 200 POST /user/user%20abc/api/terminals?1618527396193 (user abc@::ffff:10.130.2.1) 709.44ms
[D 2021-04-15 22:56:37.100 SingleUserNotebookApp auth:860] Allowing Hub admin user abc
[D 2021-04-15 22:56:37.100 SingleUserNotebookApp auth:743] Setting oauth cookie for ::ffff:10.130.2.1: jupyterhub-user-user%20abc, {‘path’: ‘/user/user%20abc/’, ‘httponly’: True}
[I 2021-04-15 22:56:37.102 SingleUserNotebookApp log:181] 200 GET /user/user%20abc/api/terminals?1618527397000 (user abc@::ffff:10.130.2.1) 3.03ms
[D 2021-04-15 22:56:38.005 SingleUserNotebookApp auth:860] Allowing Hub admin user abc
[D 2021-04-15 22:56:38.005 SingleUserNotebookApp auth:743] Setting oauth cookie for ::ffff:10.130.2.1: jupyterhub-user-user%20abc, {‘path’: ‘/user/user%20abc/’, ‘httponly’: True}
[I 2021-04-15 22:56:38.007 SingleUserNotebookApp log:181] 204 PUT /user/user%20abc/lab/api/workspaces/default?1618527397896 (user abc@::ffff:10.130.2.1) 3.08ms