Thanks for the update.
Were you able to previously access it from your workplace on port 8080? Then a few days ago couldn't? Possibly works network/security team recently implemented some blocks?
If you do need access from your workplace you could try one of:-
- if you had a spare ip address you could run ispconfig on port 443 instead of port 80. Highly likely it will simply "mix in" with other SSL traffic on 443 and not be affected by any workplace blocks.
- if your workplace allows outgoing VPN use openvpn or similar to create a tunnel to your server itself or to a machine that CAN access your server on port 8080.