diff --git a/server/src/challenge-actions/challenge-actions.controller.ts b/server/src/challenge-actions/challenge-actions.controller.ts
index c972202..56157ba 100644
--- a/server/src/challenge-actions/challenge-actions.controller.ts
+++ b/server/src/challenge-actions/challenge-actions.controller.ts
@@ -1,7 +1,7 @@
 import { Controller, Get, Post, Body, Patch, Param, Delete, ParseIntPipe, HttpCode, UseGuards, Req, Query, NotFoundException } from '@nestjs/common'
 import { ChallengeActionsService } from './challenge-actions.service'
 import { AuthenticatedRequest, JwtAuthGuard } from 'src/auth/jwt-auth.guard'
-import { ApiBearerAuth, ApiCreatedResponse, ApiNotFoundResponse, ApiOkResponse, ApiUnauthorizedResponse, ApiUnprocessableEntityResponse } from '@nestjs/swagger'
+import { ApiBearerAuth, ApiConflictResponse, ApiCreatedResponse, ApiNotFoundResponse, ApiOkResponse, ApiUnauthorizedResponse } from '@nestjs/swagger'
 import { ChallengeActionEntity } from './entities/challenge-action.entity'
 import { CreateChallengeActionDto } from './dto/create-challenge-action.dto'
 import { ApiOkResponsePaginated, paginateOutput } from 'src/common/utils/pagination.utils'
@@ -76,6 +76,7 @@ export class ChallengeActionsController {
   @ApiOkResponse({ type: ChallengeActionEntity })
   @ApiUnauthorizedResponse({ description: "Non authentifié⋅e" })
   @ApiNotFoundResponse({ description: "Objet non trouvé" })
+  @ApiConflictResponse({ description: "Aucun défi à terminer n'est en cours" })
   async endCurrent(@Req() request: AuthenticatedRequest, @Body() { success }: EndChallengeActionDto): Promise<ChallengeActionEntity> {
     const challengeAction = await this.challengeActionsService.endCurrentChallenge(request.user, success)
     return new ChallengeActionEntity(challengeAction)
diff --git a/server/src/challenge-actions/challenge-actions.service.ts b/server/src/challenge-actions/challenge-actions.service.ts
index bedc7e6..2ef16c9 100644
--- a/server/src/challenge-actions/challenge-actions.service.ts
+++ b/server/src/challenge-actions/challenge-actions.service.ts
@@ -1,4 +1,4 @@
-import { Injectable, NotAcceptableException } from '@nestjs/common'
+import { BadRequestException, Injectable, UnprocessableEntityException } from '@nestjs/common'
 import { CreateChallengeActionDto } from './dto/create-challenge-action.dto'
 import { UpdateChallengeActionDto } from './dto/update-challenge-action.dto'
 import { ChallengeAction, Player } from '@prisma/client'
@@ -55,7 +55,7 @@ export class ChallengeActionsService {
       }
     })
     if (!challengeAction)
-      throw new NotAcceptableException("Aucun défi n'est en cours")
+      throw new BadRequestException("Aucun défi n'est en cours")
     let data
     const now = new Date()
     if  (success) {
diff --git a/server/src/challenges/challenges.controller.ts b/server/src/challenges/challenges.controller.ts
index 8c62a09..3548bf3 100644
--- a/server/src/challenges/challenges.controller.ts
+++ b/server/src/challenges/challenges.controller.ts
@@ -3,7 +3,7 @@ import { ChallengesService } from './challenges.service'
 import { CreateChallengeDto } from './dto/create-challenge.dto'
 import { UpdateChallengeDto } from './dto/update-challenge.dto'
 import { AuthenticatedRequest, JwtAuthGuard } from 'src/auth/jwt-auth.guard'
-import { ApiBearerAuth, ApiCreatedResponse, ApiForbiddenResponse, ApiNotFoundResponse, ApiOkResponse, ApiUnauthorizedResponse } from '@nestjs/swagger'
+import { ApiBearerAuth, ApiConflictResponse, ApiCreatedResponse, ApiNotFoundResponse, ApiOkResponse, ApiUnauthorizedResponse } from '@nestjs/swagger'
 import { ChallengeEntity } from './entities/challenge.entity'
 import { ApiOkResponsePaginated, paginateOutput } from 'src/common/utils/pagination.utils'
 import { QueryPaginationDto } from 'src/common/dto/pagination-query.dto'
@@ -19,7 +19,6 @@ export class ChallengesController {
   @ApiBearerAuth()
   @ApiCreatedResponse({ type: ChallengeEntity, description: "Objet créé avec succès" })
   @ApiUnauthorizedResponse({ description: "Non authentifié⋅e" })
-  @ApiForbiddenResponse({ description: "Permission refusée" })
   async create(@Body() createChallengeDto: CreateChallengeDto): Promise<ChallengeEntity> {
     const challenge = await this.challengesService.create(createChallengeDto)
     return new ChallengeEntity(challenge)
@@ -30,7 +29,6 @@ export class ChallengesController {
   @ApiBearerAuth()
   @ApiOkResponsePaginated(ChallengeEntity)
   @ApiUnauthorizedResponse({ description: "Non authentifié⋅e" })
-  @ApiForbiddenResponse({ description: "Permission refusée" })
   async findAll(@Query() queryPagination?: QueryPaginationDto): Promise<PaginateOutputDto<ChallengeEntity>> {
     const [challenges, total] = await this.challengesService.findAll(queryPagination)
     return paginateOutput<ChallengeEntity>(challenges.map(challenge => new ChallengeEntity(challenge)), total, queryPagination)
@@ -41,7 +39,6 @@ export class ChallengesController {
   @ApiBearerAuth()
   @ApiOkResponse({ type: ChallengeEntity })
   @ApiUnauthorizedResponse({ description: "Non authentifié⋅e" })
-  @ApiForbiddenResponse({ description: "Permission refusée" })
   @ApiNotFoundResponse({ description: "Objet non trouvé" })
   async findOne(@Param('id', ParseIntPipe) id: number): Promise<ChallengeEntity> {
     const challenge = await this.challengesService.findOne(id)
@@ -55,7 +52,6 @@ export class ChallengesController {
   @ApiBearerAuth()
   @ApiOkResponse({ type: ChallengeEntity })
   @ApiUnauthorizedResponse({ description: "Non authentifié⋅e" })
-  @ApiForbiddenResponse({ description: "Permission refusée" })
   @ApiNotFoundResponse({ description: "Objet non trouvé" })
   async update(@Param('id', ParseIntPipe) id: number, @Body() updateChallengeDto: UpdateChallengeDto) {
     return await this.challengesService.update(id, updateChallengeDto)
@@ -67,7 +63,6 @@ export class ChallengesController {
   @ApiBearerAuth()
   @ApiOkResponse({ type: ChallengeEntity })
   @ApiUnauthorizedResponse({ description: "Non authentifié⋅e" })
-  @ApiForbiddenResponse({ description: "Permission refusée" })
   @ApiNotFoundResponse({ description: "Objet non trouvé" })
   async remove(@Param('id', ParseIntPipe) id: number) {
     await this.challengesService.remove(id)
@@ -78,8 +73,8 @@ export class ChallengesController {
   @ApiBearerAuth()
   @ApiOkResponse({ type: ChallengeEntity })
   @ApiUnauthorizedResponse({ description: "Non authentifié⋅e" })
-  @ApiForbiddenResponse({ description: "Permission refusée" })
   @ApiNotFoundResponse({ description: "Objet non trouvé" })
+  @ApiConflictResponse({ description: "Un défi est déjà en cours d'accomplissement" })
   async drawRandom(@Req() request: AuthenticatedRequest): Promise<ChallengeEntity> {
     const challenge = await this.challengesService.drawRandom(request.user)
     return new ChallengeEntity(challenge)
diff --git a/server/src/challenges/challenges.service.ts b/server/src/challenges/challenges.service.ts
index 2639cee..67db055 100644
--- a/server/src/challenges/challenges.service.ts
+++ b/server/src/challenges/challenges.service.ts
@@ -1,4 +1,4 @@
-import { Injectable, NotAcceptableException, NotFoundException } from '@nestjs/common'
+import { ConflictException, Injectable, NotFoundException } from '@nestjs/common'
 import { CreateChallengeDto } from './dto/create-challenge.dto'
 import { UpdateChallengeDto } from './dto/update-challenge.dto'
 import { Challenge, Player } from '@prisma/client'
@@ -64,7 +64,7 @@ export class ChallengesService {
       }
     })
     if (currentChallengeAction)
-      throw new NotAcceptableException("Un défi est déjà en cours d'accomplissement")
+      throw new ConflictException("Un défi est déjà en cours d'accomplissement")
     const remaningChallenges = await this.prisma.challenge.count({
       where: {
         action: null,
diff --git a/server/src/trains/trains.controller.ts b/server/src/trains/trains.controller.ts
index 8039c4c..c06fd4f 100644
--- a/server/src/trains/trains.controller.ts
+++ b/server/src/trains/trains.controller.ts
@@ -4,7 +4,7 @@ import { CreateTrainDto } from './dto/create-train.dto'
 import { UpdateTrainDto } from './dto/update-train.dto'
 import { TrainEntity } from './entities/train.entity'
 import { AuthenticatedRequest, JwtAuthGuard } from 'src/auth/jwt-auth.guard'
-import { ApiBearerAuth, ApiCreatedResponse, ApiNotFoundResponse, ApiOkResponse, ApiUnauthorizedResponse } from '@nestjs/swagger'
+import { ApiBearerAuth, ApiCreatedResponse, ApiNotFoundResponse, ApiOkResponse, ApiUnauthorizedResponse, ApiUnprocessableEntityResponse } from '@nestjs/swagger'
 import { ApiOkResponsePaginated, paginateOutput } from 'src/common/utils/pagination.utils'
 import { QueryPaginationDto } from 'src/common/dto/pagination-query.dto'
 import { PaginateOutputDto } from 'src/common/dto/pagination-output.dto'
@@ -76,6 +76,7 @@ export class TrainsController {
   @ApiBearerAuth()
   @ApiCreatedResponse({ type: TrainEntity, description: "Train importé avec succès" })
   @ApiUnauthorizedResponse({ description: "Non authentifié⋅e" })
+  @ApiUnprocessableEntityResponse({ description: "Le voyage Interrail à importer contient plusieurs trajets ou plusieurs trains" })
   async import(@Req() request: AuthenticatedRequest, @Body() importTrainDto: ImportTrainDto): Promise<TrainEntity> {
     const train = await this.trainsService.import(request.user, importTrainDto)
     return new TrainEntity(train)
diff --git a/server/src/trains/trains.service.ts b/server/src/trains/trains.service.ts
index 300e329..eafce5a 100644
--- a/server/src/trains/trains.service.ts
+++ b/server/src/trains/trains.service.ts
@@ -1,4 +1,4 @@
-import { Injectable, NotAcceptableException } from '@nestjs/common'
+import { Injectable, UnprocessableEntityException } from '@nestjs/common'
 import { CreateTrainDto } from './dto/create-train.dto'
 import { UpdateTrainDto } from './dto/update-train.dto'
 import { PrismaService } from 'src/prisma/prisma.service'
@@ -53,10 +53,10 @@ export class TrainsService {
     const interrailResult: InterrailJourney = await fetch(`https://3uiwjsimnh.execute-api.eu-central-1.amazonaws.com/Prod/journey-import?id=${trainId}`)
       .then(data => data.json())
     if (interrailResult.data.travels.length !== 1)
-      throw new NotAcceptableException(`Ce voyage contient ${interrailResult.data.travels.length} trajets. Merci d'ajouter les trajets un à un.`)
+      throw new UnprocessableEntityException(`Ce voyage contient ${interrailResult.data.travels.length} trajets. Merci d'ajouter les trajets un à un.`)
     const travel = interrailResult.data.travels[0]
     if (travel.legs.length !== 1)
-      throw new NotAcceptableException(`Ce trajet contient ${travel.legs.length} trains. Merci d'ajouter les trajets un à un.`)
+      throw new UnprocessableEntityException(`Ce trajet contient ${travel.legs.length} trains. Merci d'ajouter les trajets un à un.`)
     const leg = travel.legs[0]
 
     const travelInfoJson: InterrailTravelInfo = JSON.parse(travel.infoJson)