Users unable to reconnect to disconnected session to access their Citrix virtual desktop.

Unable to reconnect to a disconnected session with error "Unknown Client error 1110" when using CVAD 2203 CU3 and earlier. When problem occurs, it is also not possible to connect via RDP. Logon stays at stuck under the "Other User Welcome" screen...

CVAD 1912 CU2 || Unable launch applications / Desktop from client - Unknown client error 1110, Proxy error

User can access to Published app locally. .User cannot access published apps or desktop through VPN from client machine.Ping and access Domain server, local DNS, etc working fine...