If you have trouble logging into the WordPress administration interface from abroad, you need to enable that country in the .htaccess file.
You need to add the country in .htaccess in the following format: SetEnvIf GEOIP_COUNTRY_CODE XX AllowCountry
It is enough to replace XX with the country code.
For example, for India it would look like this: SetEnvIf GEOIP_COUNTRY_CODE IN AllowCountry
Country codes of individual countries can be found at: http://dev.maxmind.com/geoip/legacy/codes/iso3166