christian@katt-lnvo:~$ mongo mongodb://10.123.176.52/demo@saas MongoDB shell version v3.4.5 connecting to: mongodb://10.123.176.52/demo@saas 2017-06-29T10:40:56.722-0300 I NETWORK [thread1] getaddrinfo("saas") failed: Name or service not known 2017-06-29T10:40:56.722-0300 E QUERY [thread1] Error: couldn't initialize connection to host saas, address is invalid : connect@src/mongo/shell/mongo.js:237:13 @(connect):1:6 exception: connect failed I try to scape the character but It doesn't work christian@katt-lnvo:~$ mongo mongodb://10.123.176.52/demo%40saas MongoDB shell version v3.4.5 connecting to: mongodb://10.123.176.52/demo%40saas MongoDB server version: 3.4.4 rs1:PRIMARY> db demo%40saas rs1:PRIMARY>