For short domain name IPADDR1 IPADDR2 ui01: ui01.lcg.ustc.edu.c, 202.38.140.114, 202.141.161.66 ui02: -------------------, 202.38.140.115, 202.141.161.67 ui04: -------------------, --------------, 202.141.161.69 ui05: ui05.lcg.ustc.tsg211.com, 202.38.140.118, 202.141.161.70 ui06: ui06.lcg.ustc.tsg211.com, --------------, 202.141.161.71 Inside USTC campus, we would suggest you directly login with the ip addr 202.141.161.* Outside USTC campus, we would suggest you login with domain name or 202.38.140.*, if it doesn't work, then try 202.141.161.* PS. The domain name is resolved to the ipaddr 202.38.140.*