Hello,
These troubleshooting articles might be helpful-
https://community.safe.com/s/article/error-communicating-with-fme-server-host
https://community.safe.com/s/article/Known-Issue-Anydesk-Application
What HTTP error response code do you see when accessing the page? You can use the developer tools for further analysis.
Do you see this error on all Server Web UI pages?
Please see the list of ports that should be opened-
1) Web App server- Core communication- TCP 80 8or 443 if using HTTPS],7076,7071,7069,7081,7077,7075,7073
2) Core -FME Server DB Communication- 7082 8or another DB port being used]
3) Engine -FME Server DB Communication- 70820or another DB port being used]
4) Web App -FME Server DB Communication- 70820or another DB port being used]
5) Core-Engines communication- 7069,7070,7500
6) Engine - File share communication- 445,7079
7) Core- File share communication- 7079
8) Web App- File share communication- 7079
9) Engine - 7074,7073,6379
10) Load balancer- Web App communication (in case of fault-tolerant setup )- 7078,80 8or 443 if using HTTPS]