Recently I have faced below problem with ESR,ID launch
Recently My system was formatted, To open sap pi components(ESR,ID), I have updated host file information,
There was problem to launch ESR and ID gui in my system, saying internal error.( I have verified, right java version)
I have identified the problem is with the host file,
Initially, our office sap pi server configured as xxxpi73 , later it is modified xxxpi73.xxx.com , So after maintaining these two host names for the same ip, I am able to open esr and id gui in my system.
Other reason , firewall settings, speak with network team on this.