# Maven proxy repository 404 error

## post by vignesh.vellore_sudhagar on May 18, 2023

Vignesh V S

vignesh.vellore_sudhagar

[May 2023](https://community.sonatype.com/t/maven-proxy-repository-404-error/10643 "Post date")

Hi,

we have maven proxy repository, when try to download package we got many 401 errors did some search and enabled pre-emptive authentication in repository settings after that receiving 404 error for some of the packages it was available in source also previous successful builds are failing with below error

```auto
The following artifacts could not be resolved: org.apache.httpcomponents:httpclient:jar:4.5.13,
org.apache.httpcomponents:httpcore:jar:4.4.13, org.apache.avro:avro:jar:1.8.2,
org.codehaus.jackson:jackson-core-asl:jar:1.9.13, org.codehaus.jackson:jackson-mapper-asl:jar:1.9.13,
org.xerial.snappy:snappy-java:jar:1.1.1.3, org.apache.logging.log4j:log4j-core:jar:2.19.0,
org.apache.logging.log4j:log4j-layout-template-json:jar:2.19.0, org.apache.logging.log4j:log4j
api:jar:2.19.0, org.apache.poi:poi:jar:5.2.3, org.apache.commons:commons-collections4:jar:4.4,
org.apache.commons:commons-math3:jar:3.6.1, org.apache.poi:poi-ooxml:jar:5.2.3,
org.apache.poi:poi-ooxml-lite:jar:5.2.3, org.apache.xmlbeans:xmlbeans:jar:5.1.1, org.apache.commons:commons-compress:jar:1.21, org.checkerframework:checker-qual:jar:3.12.0,
org.hibernate.validator:hibernate-validator:jar:8.0.0.Final, org.yaml:snakeyaml:jar:1.33,
org.jsoup:jsoup:jar:1.15.3, org.projectlombok:lombok:jar:1.18.24, org.jetbrains.kotlin:kotlin
stdlib:jar:1.6.20, org.apache.commons:commons-lang3:jar:3.12.0, org.apache.commons:commons
text:jar:1.10.0, commons-beanutils:commons-beanutils:jar:1.9.4, org.antlr:antlr4-runtime:jar:4.5,
org.eclipse.jetty:jetty-client:jar:9.4.48.v20220622, org.eclipse.jetty:jetty-http:jar:9.4.48.v20220622,
org.eclipse.jetty:jetty-util:jar:9.4.48.v20220622, org.eclipse.jetty:jetty-server:jar:9.4.48.v20220622,
org.mockito:mockito-core:jar:1.10.19, org.elasticmq:elasticmq-rest-sqs_2.13:jar:1.3.14, org.scala
lang:scala-library:jar:2.13.8, org.elasticmq:elasticmq-core_2.13:jar:1.3.14, org.scala-lang.modules:scala-xml_2.13:jar:2.1.0, org.scala-lang.modules:scala-java8-compat_2.13:jar:1.0.0,
org.scala-lang.modules:scala-parser-combinators_2.13:jar:1.1.2, org.scala-lang:scala
reflect:jar:2.13.8, org.mockito:mockito-all:jar:1.10.19, org.javassist:javassist:jar:3.20.0-GA,
org.testng:testng:jar:7.6.1, org.webjars:jquery:jar:3.6.0:
```

If uncheck the pre-emptive authentication the build was passing but getting 401 errors in request log it increasing application error percentage how to resolve this any idea

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