Hi Johnny,
Are the other apps working fine and the error occurs in specific with G/L account app?
Can you also perform search for G/L account via 'ESH_Search' tcode to see if the search is working good?
Also can you please confirm if you are able to access the below URL.
http://HOST_NAME:WebDispatcherPort/sap/es/ina/getserverinfo
i did a search with g/L account factsheet here and it works fine.
Regards
Virinchy