Hi,
First check whether your host name (crm.grupoxxxxx.com) is same as mentioned in the parameter icm/host_name_full and same for http port if it's 8000, check with basis team.
Also one more correction in host file you have to give sap server IP address and host name, not your IP address.
Example: 192.168.5.10 crm.grupoxxxxx.com
Also check if the same error is coming in firefox by copy pasting the same url over there.
--Shobhit