500 Connection timed out

Hi,

We have a job chain which has around 300 jobs in it. Our jobs retention period is of 30 days. When we try to pull the history of this job chain, it takes more than 10 minutes to pull the history or sometimes it displays '500 Connection timed out'. Please advise. When we pull the history of 'All(non-maintenance) jobs, it is lot quicker.

Regards,

Tinku