Guaranteed delivery issues

Hello,

I have created guaranteed delivery services synchronize services. when backend http available send the data.
when I have shutdown the backend http client URL. after some time startup client Http URL not sending the data.
some times job success but not receive the data and some times getting below error.

[794]2021-12-23 22:11:00 AST [ISC.0063.0083E] (tid=87) Reset TContext com.wm.app.b2b.client.ServiceException: [ISC.0036.9112] Unable to reset job manager - enabled

Can you please anyone help me.

Thanks and Regards
Kanaka