If your proxy username is on a domain you will need to have the domain in the username box as well.
<username>MyDomain/MyUsername</username>
// Json
Type: Posts; User: Json
If your proxy username is on a domain you will need to have the domain in the username box as well.
<username>MyDomain/MyUsername</username>
// Json
What version of Maven are you using?
// Json
Yes Id say you are getting this error because maven cant download an artifact you need.
// Json