While working on the Web DynPro application development I encountered SAP FQDN error where SAP server location would not resolve due to security settings in application server demands the URL to be fully qualified i.e. "<system>.<domain>.<extension>" e.g. 'ecc.sap.com'.
Following are the steps to setup FQDN in SAP.
1. Go to RZ10 select Default profile in change mode.
2. Add parameter SAPFQDN = xxxx.xxx e.g. sap.com
3. Add parameter SAPLOCALHOSTFULL = $(SAPLOCALHOST).$(SAPFQDN)
4. Maintain SAPLOCALHOST or SAPGLOBALHOST to successful resolution.
5. Go to SMICM->Administration->ICM->Restart->Yes
