Unable to resolve host

[RedSingularity]

Hey everyone, i am having a problem in the terminal window. When i try to do various operations i get the following message before the operation starts.

sudo: unable to resolve host Tims-Laptop

Any ideas as to a cure?

[Brandon Williams]

If your /etc/hostname file contains the name 'Tims-Laptop', then there should be an entry for Tims-Laptop in your /etc/hosts file, too, as in:

127.0.1.1 Tims-Laptop

This will allow the hostname to be resolved to a localhost address.

[RedSingularity]

Thanks for that.......using your idea one thing led to another and I found the problem.

Turns out you cant have a hostname with capitals in it. Problem solved.

[Iowan]

Problem solved.

This kind of solved?

[Brandon Williams]

Turns out you cant have a hostname with capitals in it. Problem solved.

The RFC is actually quite clear about the fact that you can use upper case characters in hostnames, but that hostnames should be interpreted in a case-insensitive manner. This means that 'Tims-Laptop' would be invalid if you are also trying to use 'tims-laptop', but that 'Tims-Laptop' is perfectly valid if there are no such collisions. A small amount of experimentation shows that my 10.04 system handles hostnames in just this way.

One of the other things that you did must have solved the problem.

[RedSingularity]

Interesting......I am going to have to experiment some more then.

[wollewichtig]

If your /etc/hostname file contains the name 'Tims-Laptop', then there should be an entry for Tims-Laptop in your /etc/hosts file, too, as in:

127.0.1.1 Tims-Laptop

This will allow the hostname to be resolved to a localhost address.

I have the same problem and tried the recommended input in the terminal, but reply is there is no such file or directory?

But if I go to File System/etc there is a file named hostname with my user name (admin) in it. But only the name, I actually had to change it lately to a shorter version in order to connect from my Windows laptop.