Bad server response after upgrade 5.8.5 to 5.9.1

[Bill]

We have 2 instances of espo, one is fine, one is giving this error 'bad server response'

- logout/login
- nothing mentioned in data/log/
- nothing mentioned in apache logs
- data/log is 775

Anyone an idea?

[esforim]

I get these error too but it was from 5.9.0 to 5.9.1. For me it due to mySQL max user connections. There is only 1 user (me) but because it pull multiple Relationship record it seem to overload the server. It getting less lately (could be due to cache) but it noticeable when I click too fast.

Have you check out Browser's console after you see the Bad server response? (Press F12 on your web browser).

[Maximus]

Hi Bill,
Please investigate the log file in the /data/logs directory.

[Bill]

Hi Bill,
Please investigate the log file in the /data/logs directory.

Thanks, but no errors in the log directory

[Maximus]

Did you also check the espcrm's tip?
Try to gather more info with F12 (check the 'Console' tab).