mvn import error

 Hi

Out of a sudden I am running into mvn errors that I don't seem to able to resolve.  When I do  

This the sample error I get when I try to do clean or compile on couple of projects that used to work fine.

ERROR] Failed to execute goal on project AProject: Could not resolve dependencies for project com.ge.lcre.de:AProject:war:v100: Failed to collect dependencies at org.springframework.boot:spring-boot-starter-data-jpa:jar:1.4.2.RELEASE: Failed to read artifact descriptor for org.springframework.boot:spring-boot-starter-data-jpa:jar:1.4.2.RELEASE: Could not transfer artifact org.springframework.boot:spring-boot-starter-data-jpa:pom:1.4.2.RELEASE from/to central (https://repo.maven.apache.org/maven2): repo.maven.apache.org: Unknown host repo.maven.apache.org -> [Help 1]
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Any pointers to what I could be doing wrong would be greatly appreciated.   this part of the lat message from/to central (https://repo.maven.apache.org/maven2) seems to point to mvn2 when the project is setup for mvn3.   I am not sure if this is relevant to the errors.   

Thank you for your help