Resolved 502 Bad Gateway after today's System Updates

[raykai]

all my websites are giving a 502 Bad Gateway after plesk did a auto System Updates...
i dont know where to start to find where the error is.

only thing i see in logs is:

1373#0: *41 connect() failed (111: Connection refused) while connecting to upstream nginx error

i did a full reboot and it did not help.
plz help

 

[raykai]

if i tern off Proxy mode (Nginx proxies requests to Apache Turn off to stop using Apache.) in Apache & nginx Settings then website works but then Nginx is not working.
this in on ‪Ubuntu 16.04.1 LTS‬

 

[raykai]

it seams that after the update my fail2ban banned my server IP under the jail: plesk-apache
this is the 1st time it dose this. any reson why it would bann its own IP for plesk-apache jail after a system update ?


deleting my servers IP from that jail fixed the error but im still wandering why it happen

 

[Bitpalast]

You should always have your public IPv4 address and 127.0.0.1 added to the fail2ban whitelist to avoid such blocking.