diff --git a/README.md b/README.md
index ba7b077..7ba7e0e 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,8 @@ concurrency: 4
 reconnectTimeout: 10
 refreshRate: 1000
 tmpDir: /dev/shm/printnatura
+retryAttempts: 3
+retryTimeout: 1000
 db:
   host: localhost
   port: 3306
@@ -44,7 +46,6 @@ salix:
 Exec
 ```
 > docker run --name printnatura -it --rm -v $PWD/config.local.yml:/printnatura/config.local.yml:ro -v $PWD/cupsd.conf:/etc/cups/cupsd.conf:ro -p 80:631 printnatura
-
 ```
 
 Bash
diff --git a/config.yml b/config.yml
index 31c230b..f072e64 100644
--- a/config.yml
+++ b/config.yml
@@ -7,6 +7,8 @@ concurrency: 4
 reconnectTimeout: 10
 refreshRate: 1000
 tmpDir: /dev/shm/printnatura
+retryAttempts: 3
+retryTimeout: 1500
 db:
   host: localhost
   port: 3306
diff --git a/print-server.js b/print-server.js
index 27a6712..8b7f6fd 100644
--- a/print-server.js
+++ b/print-server.js
@@ -15,322 +15,335 @@ const errorQuery = fs.readFileSync(`sql/updateError.sql`).toString();
 const printedQuery = fs.readFileSync(`sql/updatePrinted.sql`).toString();
 
 class PrintServer {
-    async start() {
-        let conf = yml(path.join(__dirname, 'config.yml'));
-        const localConfFile = path.join(__dirname, 'config.local.yml');
-        if (fs.existsSync(localConfFile))
-            conf = Object.assign({}, conf, yml(localConfFile));
-        this.conf = conf;
-        this.jobs = [];
+	async start() {
+		let conf = yml(path.join(__dirname, 'config.yml'));
+		const localConfFile = path.join(__dirname, 'config.local.yml');
+		if (fs.existsSync(localConfFile))
+			conf = Object.assign({}, conf, yml(localConfFile));
+		this.conf = conf;
+		this.jobs = [];
 
-        console.clear();
-        const decoration = '△▽'.repeat(10);
-        const printnatura = colors.bgBlack.bold(' Print'.white + 'Natura '.green);
-        console.log(`${decoration} ${printnatura} ${decoration}`);
-        if (this.conf.debug)
-            this.serverLog('log', 'Debug mode enabled'.yellow);
-        if (this.conf.dryPrint)
-            this.serverLog('log', 'Running in dry print mode, documents won\'t be printed'.yellow);
-        if (this.conf.keepFile)
-            this.serverLog('log', 'Keep file enabled, documents won\'t be deleted from disk'.yellow);
+		console.clear();
+		const decoration = '△▽'.repeat(10);
+		const printnatura = colors.bgBlack.bold(' Print'.white + 'Natura '.green);
+		console.log(`${decoration} ${printnatura} ${decoration}`);
+		if (this.conf.debug)
+			this.serverLog('log', 'Debug mode enabled'.yellow);
+		if (this.conf.dryPrint)
+			this.serverLog('log', 'Running in dry print mode, documents won\'t be printed'.yellow);
+		if (this.conf.keepFile)
+			this.serverLog('log', 'Keep file enabled, documents won\'t be deleted from disk'.yellow);
 
-        await this.init();
-        this.rejectionHandler = (err, p) => this.onRejection(err, p);
-        process.on('unhandledRejection', this.rejectionHandler);
+		await this.init();
+		this.rejectionHandler = (err, p) => this.onRejection(err, p);
+		process.on('unhandledRejection', this.rejectionHandler);
 
-        this.serverLog('log', 'Ready to print'.green);
-        await this.poll();
-    }
-    async stop() {
-        this.serverLog('log', 'Bye ( ◕ ‿ ◕ )っ'.green);
-        process.off('unhandledRejection', this.rejectionHandler);
-        await this.end();
-    }
-    async init() {
-        const conf = this.conf;
-        const api = this.api = axios.create({
-            baseURL: `${conf.salix.url}/api/`
-        });
-        api.interceptors.request.use(config => {
-            if (this.token)
-                config.headers['Authorization'] = this.token
-            return config;
-        });
-        await this.getToken();
+		this.serverLog('log', 'Ready to print'.green);
+		await this.poll();
+	}
+	async stop() {
+		this.serverLog('log', 'Bye ( ◕ ‿ ◕ )っ'.green);
+		process.off('unhandledRejection', this.rejectionHandler);
+		await this.end();
+	}
+	async init() {
+		const conf = this.conf;
+		const api = this.api = axios.create({
+			baseURL: `${conf.salix.url}/api/`
+		});
+		api.interceptors.request.use(config => {
+			if (this.token)
+				config.headers['Authorization'] = this.token
+			return config;
+		});
+		await this.getToken();
 
-        this.pool = await mysql.createPool(conf.db);
-    }
-    async end() {
-        if (this.token) {
-            await this.api.post(`Accounts/logout`);
-            this.token = null;
-        }
-        if (this.pollTimeout) {
-            clearTimeout(this.pollTimeout);
-            this.pollTimeout = null;
-        }
-        await this.pool.end();
-    }
-    async getToken() {
-        const salix = this.conf.salix;
-        let response = await this.api.post(`Accounts/login`, {
-            user: salix.user,
-            password: salix.password
-        });
-        this.token = response.data.token;
-    }
-    serverLog(realm, message) {
-        this.log(`Server`, realm, message);
-    }
-    log(classMsg, realm, message) {
-        classMsg = `${classMsg}:`;
+		this.pool = await mysql.createPool(conf.db);
+	}
+	async end() {
+		if (this.token) {
+			await this.api.post(`Accounts/logout`);
+			this.token = null;
+		}
+		if (this.pollTimeout) {
+			clearTimeout(this.pollTimeout);
+			this.pollTimeout = null;
+		}
+		await this.pool.end();
+	}
+	async getToken() {
+		const salix = this.conf.salix;
+		let response = await this.api.post(`Accounts/login`, {
+			user: salix.user,
+			password: salix.password
+		});
+		this.token = response.data.token;
+	}
+	serverLog(realm, message) {
+		this.log(`Server`, realm, message);
+	}
+	log(classMsg, realm, message) {
+		classMsg = `${classMsg}:`;
 
-        switch(realm) {
-            case 'debug':
-                if (this.conf.debug) console.debug(classMsg, message.magenta);
-                break;
-            case 'error':
-                console.error(classMsg, message.red);
-                break;
-            default:
-                if (this.conf.log) console.log(classMsg, message);
-        }
-    }
-    onRejection(err, p) {
-        console.debug('unhandledRejection');
-        this.errorHandler(err);
-    }
-    errorHandler(err) {
-        if (err.code === 'ETIMEDOUT') {
-            if (!this.dbDown) {
-                this.dbDown = true;
-                this.serverLog('error', `DB connection lost: ${err.message}`);
-            }
-        } else
-            console.error(err);
-    }
-    async poll() {
-        this.pollTimeout = null;
-        let delay = this.conf.refreshRate;
-        await this.getJobs();
-        if (this.dbDown) delay = this.conf.reconnectTimeout * 1000;
-        this.pollTimeout = setTimeout(() => this.poll(), delay);
-    }
-    async getJobs() {
-        if (this.polling) return;
-        this.polling = true;
-        const conf = this.conf;
+		switch(realm) {
+			case 'debug':
+				if (this.conf.debug) console.debug(classMsg, message.magenta);
+				break;
+			case 'error':
+				console.error(classMsg, message.red);
+				break;
+			default:
+				if (this.conf.log) console.log(classMsg, message);
+		}
+	}
+	onRejection(err, p) {
+		console.debug('unhandledRejection');
+		this.errorHandler(err);
+	}
+	errorHandler(err) {
+		if (err.code === 'ETIMEDOUT') {
+			if (!this.dbDown) {
+				this.dbDown = true;
+				this.serverLog('error', `DB connection lost: ${err.message}`);
+			}
+		} else
+			console.error(err);
+	}
+	async poll() {
+		this.pollTimeout = null;
+		let delay = this.conf.refreshRate;
+		await this.getJobs();
+		if (this.dbDown) delay = this.conf.reconnectTimeout * 1000;
+		this.pollTimeout = setTimeout(() => this.poll(), delay);
+	}
+	async getJobs() {
+		if (this.polling) return;
+		this.polling = true;
+		const conf = this.conf;
 
-        if (this.dbDown) {
-            try {
-                const conn = await this.pool.getConnection();
-                try {
-                    await conn.ping();
-                    this.dbDown = false;
-                    this.serverLog('log', 'DB connection recovered'.green);
-                } catch (err) {
-                    conn.release();
-                }
-            } catch(e) {}
-        }
+		if (this.dbDown) {
+			try {
+				const conn = await this.pool.getConnection();
+				try {
+					await conn.ping();
+					this.dbDown = false;
+					this.serverLog('log', 'DB connection recovered'.green);
+				} catch (err) {
+					conn.release();
+				}
+			} catch(e) {}
+		}
 
-        if (!this.dbDown) {
-            try {
-                let nJobs = 0;
-                while (this.jobs.length < conf.concurrency) {
-                    const jobId = await this.getJob();
-                    if (jobId) {
-                        nJobs++;
-                        this.jobs.push(jobId);
-                        const jobP = this.printJob(jobId);
-                        // XXX: Workaround for Promise unhandledRejection
-                        // https://stackoverflow.com/questions/67789309/why-do-i-get-an-unhandled-promise-rejection-with-await-promise-all
-                        jobP.catch(err => this.errorHandler(err));
-                    } else
-                        break;
-                }
-                if (nJobs > 0)
-                    this.serverLog('debug', `${nJobs} jobs buffered`);
-            } catch (err) {
-                this.errorHandler(err);
-            }
-        }
+		if (!this.dbDown) {
+			try {
+				let nJobs = 0;
+				while (this.jobs.length < conf.concurrency) {
+					const jobId = await this.getJob();
+					if (jobId) {
+						nJobs++;
+						this.jobs.push(jobId);
+						const jobP = this.printJob(jobId);
+						// XXX: Workaround for Promise unhandledRejection
+						// https://stackoverflow.com/questions/67789309/why-do-i-get-an-unhandled-promise-rejection-with-await-promise-all
+						jobP.catch(err => this.errorHandler(err));
+					} else
+						break;
+				}
+				if (nJobs > 0)
+					this.serverLog('debug', `${nJobs} jobs buffered`);
+			} catch (err) {
+				this.errorHandler(err);
+			}
+		}
 
-        this.polling = false;
-    }
-    async getJob() {
-        let jobId;
+		this.polling = false;
+	}
+	async getJob() {
+		let jobId;
 
-        const conn = await this.pool.getConnection();
-        try {
-            await conn.beginTransaction();
-            try {
-                const [[printJob]] = await conn.query(selectQuery);
-                if (printJob) {
-                    jobId = printJob.id;
-                    await conn.query(printingQuery, [
-                        'printing',
-                        now(),
-                        null,
-                        null,
-                        this.conf.serverId || os.hostname,
-                        jobId
-                    ]);
-                    this.jobLog(jobId, 'debug', 'get: printing');
-                    await conn.commit();
-                } else
-                    await conn.rollback();
-            } catch (err) {
-                try {
-                    await conn.rollback();
-                } catch (e) {}
-                if (jobId)
-                    this.jobLog(jobId, 'error', err.message);
-                throw err;
-            }
-        } finally {
-            conn.release();
-        }
+		const conn = await this.pool.getConnection();
+		try {
+			await conn.beginTransaction();
+			try {
+				const [[printJob]] = await conn.query(selectQuery);
+				if (printJob) {
+					jobId = printJob.id;
+					await conn.query(printingQuery, [
+						'printing',
+						now(),
+						null,
+						null,
+						this.conf.serverId || os.hostname,
+						jobId
+					]);
+					this.jobLog(jobId, 'debug', 'get: printing');
+					await conn.commit();
+				} else
+					await conn.rollback();
+			} catch (err) {
+				try {
+					await conn.rollback();
+				} catch (e) {}
+				if (jobId)
+					this.jobLog(jobId, 'error', err.message);
+				throw err;
+			}
+		} finally {
+			conn.release();
+		}
 
-        return jobId;
-    }
-    async printJob(jobId) {
-        const conf = this.conf;
-        let jobData;
-        const args = {};
-        let tmpFilePath;
-        let tmpFileCreated = false;
+		return jobId;
+	}
+	async printJob(jobId) {
+		const conf = this.conf;
+		let jobData;
+		const args = {};
+		let tmpFilePath;
+		let tmpFileCreated = false;
 
-        let conn;
-        try {
-            conn = await this.pool.getConnection();
+		let conn;
+		try {
+			conn = await this.pool.getConnection();
 
-            // Job data
-            await conn.beginTransaction();
-            try {
-                const [[data]] = await conn.query(jobDataQuery, jobId);
-                jobData = data;
+			// Job data
+			await conn.beginTransaction();
+			try {
+				const [[data]] = await conn.query(jobDataQuery, jobId);
+				jobData = data;
 
-                const [res] = await conn.query(jobArgsQuery, jobId);
-                for (const row of res)
-                    args[row.name] = row.value;
-            } finally {
-                await conn.rollback();
-            }
+				const [res] = await conn.query(jobArgsQuery, jobId);
+				for (const row of res)
+					args[row.name] = row.value;
+			} finally {
+				await conn.rollback();
+			}
 
-            // Path params
-            const usedParams = new Set();
-            const methodPath = jobData.method.replace(/{\w+}/g, function(match) {
-                const key = match.substr(1, match.length - 2);
-                const value = args[key];
-                usedParams.add(key);
-                return value !== undefined ? value : match;
-            });
+			// Path params
+			const usedParams = new Set();
+			const methodPath = jobData.method.replace(/{\w+}/g, function(match) {
+				const key = match.substr(1, match.length - 2);
+				const value = args[key];
+				usedParams.add(key);
+				return value !== undefined ? value : match;
+			});
 
-            // URL params
-            const params = {userFk: jobData.userFk};
-            for (const key in args) {
-                if (!usedParams.has(key))
-                    params[key] = args[key];
-            }
-            const urlParams = new URLSearchParams(params);
+			// URL params
+			const params = {userFk: jobData.userFk};
+			for (const key in args) {
+				if (!usedParams.has(key))
+					params[key] = args[key];
+			}
+			const urlParams = new URLSearchParams(params);
 
-            const url = `${methodPath}?${urlParams.toString()}`;
-            this.jobLog(jobId, 'debug', `api: ${url}`);
+			const url = `${methodPath}?${urlParams.toString()}`;
+			this.jobLog(jobId, 'debug', `api: ${url}`);
 
-            // Request
-            let pdfData;
-            for (let attempts = 0; !pdfData && attempts < 2; attempts++) {
-                try {
-                    const res = await this.api({
-                        method: 'get',
-                        url,
-                        responseType: 'arraybuffer',
-                        headers: {'Accept': 'application/pdf'}
-                    });
-                    pdfData = res.data;  
-                }
-                catch (err) {
-                    if (err.name === 'AxiosError' && err.code === 'ERR_BAD_REQUEST') {
-                        const res = err.response;
-                        if (res.status === 401) { // Unauthorized
-                            await this.getToken();
-                        } else {
-                            const resMessage = JSON.parse(res.data).error.message;
-                            const resErr = new Error(`${err.message}: ${resMessage}`);
-                            resErr.stack = err.stack;
-                            throw resErr;
-                        }
-                    } else
-                        throw err;
-                }
-            }
+			// Request
+			let pdfData;
+			for (let attempts = 0; !pdfData && attempts < this.conf.retryAttempts; attempts++) {
+				try {
+					const res = await this.api({
+						method: 'get',
+						url,
+						responseType: 'arraybuffer',
+						headers: {'Accept': 'application/pdf'}
+					});
+					pdfData = res.data;  
+				}
+				catch (err) {
+					if (err.name === 'AxiosError' && attempts < this.conf.retryAttempts - 1) {
+						const res = err.response;
+						switch(res.status) {
+							case 401: // Unauthorized
+								await this.getToken();
+								break;
+							case 502 || 504: // Bad Gateway & Gateway Timeout
+								await new Promise(
+									resolve => setTimeout(resolve, this.conf.retryTimeout));
+								break;
+							default:
+								try {
+									if (err.code === 'ERR_BAD_REQUEST') {
+										const resMessage = JSON.parse(res.data).error.message;
+										const resErr = new Error(`${err.message}: ${resMessage}`);
+										resErr.stack = err.stack;
+										throw resErr;
+									} else
+										throw err;
+								} catch (err) {
+									throw err;
+								}
+						}
+					} else
+						throw err;
+				}
+			}
 
-            // Save PDF to disk
-            const printer = jobData.printer;
-            const tmpPath = conf.tmpDir;
-            if (!fs.existsSync(tmpPath))
-                fs.mkdirSync(tmpPath)
-            tmpFilePath = path.join(tmpPath, `job-${jobId}.pdf`);
-            await fs.writeFile(tmpFilePath, pdfData, 'binary');
-            tmpFileCreated = true;
+			// Save PDF to disk
+			const printer = jobData.printer;
+			const tmpPath = conf.tmpDir;
+			if (!fs.existsSync(tmpPath))
+				fs.mkdirSync(tmpPath)
+			tmpFilePath = path.join(tmpPath, `job-${jobId}.pdf`);
+			await fs.writeFile(tmpFilePath, pdfData, 'binary');
+			tmpFileCreated = true;
 
-            // Print PDF
-            const printCommand = `lp -d "${printer}" "${tmpFilePath}"`;
-            this.jobLog(jobId, 'debug', `print: ${printCommand}`);
-            try {
-                if (!conf.dryPrint) await pExec(printCommand);
-            } catch(err) {
-                throw new Error(`Print error: ${err.message}`);
-            }
+			// Print PDF
+			const printCommand = `lp -d "${printer}" "${tmpFilePath}"`;
+			this.jobLog(jobId, 'debug', `print: ${printCommand}`);
+			try {
+				if (!conf.dryPrint) await pExec(printCommand);
+			} catch(err) {
+				throw new Error(`Print error: ${err.message}`);
+			}
 
-            await conn.query(printedQuery, ['printed', now(), jobId]);
-            this.jobLog(jobId, 'log', `${jobData.report}: '${printCommand}': GET ${url}`);
-        } catch (err) {
-            try {
-                await conn.query(errorQuery, ['error', now(), err.message, jobId]);
-            } catch (e) {
-                this.jobLog(jobId, 'error', e.message);
-            }
+			await conn.query(printedQuery, ['printed', now(), jobId]);
+			this.jobLog(jobId, 'log', `${jobData.report}: '${printCommand}': GET ${url}`);
+		} catch (err) {
+			try {
+				await conn.query(errorQuery, ['error', now(), err.message, jobId]);
+			} catch (e) {
+				this.jobLog(jobId, 'error', e.message);
+			}
 
-            this.jobLog(jobId, 'error', err.message);
-            const jobErr = new Error(`(${jobId}) ${err.message}`);
-            jobErr.stack = err.stack;
-            throw jobErr;
-        } finally {
-            if (conn) conn.release();
+			this.jobLog(jobId, 'error', err.message);
+			const jobErr = new Error(`(${jobId}) ${err.message}`);
+			jobErr.stack = err.stack;
+			throw jobErr;
+		} finally {
+			if (conn) conn.release();
 
-            if (!conf.keepFile) {
-                try {
-                    const shouldDelete = tmpFileCreated
-                        || (tmpFilePath && await fs.pathExists(tmpFilePath));
-                    if (shouldDelete) await fs.unlink(tmpFilePath);
-                } catch (err) {
-                    this.jobLog(jobId, 'error', err.message);
-                }
-            }
+			if (!conf.keepFile) {
+				try {
+					const shouldDelete = tmpFileCreated
+						|| (tmpFilePath && await fs.pathExists(tmpFilePath));
+					if (shouldDelete) await fs.unlink(tmpFilePath);
+				} catch (err) {
+					this.jobLog(jobId, 'error', err.message);
+				}
+			}
 
-            const index = this.jobs.indexOf(jobId);
-            if (index !== -1) this.jobs.splice(index, 1);
-            setTimeout(() => this.getJobs());
-        }
-    }
-    jobLog(jobId, realm, message) {
-        this.log(`Job[${colors.yellow(jobId)}]`, realm, message);
-    }
+			const index = this.jobs.indexOf(jobId);
+			if (index !== -1) this.jobs.splice(index, 1);
+			setTimeout(() => this.getJobs());
+		}
+	}
+	jobLog(jobId, realm, message) {
+		this.log(`Job[${colors.yellow(jobId)}]`, realm, message);
+	}
 }
 
 module.exports = PrintServer;
 
 function pExec(command) {
-    return new Promise(function(resolve, reject) {
-        exec(command, function(err, stdout, stderr) {
-            if (err) return reject(err);
-            resolve({stdout, stderr})
-        });
-    });
+	return new Promise(function(resolve, reject) {
+		exec(command, function(err, stdout, stderr) {
+			if (err) return reject(err);
+			resolve({stdout, stderr})
+		});
+	});
 }
 
 function now() {
-    return new Date().toISOString().slice(0, 19).replace('T', ' ');
+	return new Date().toISOString().slice(0, 19).replace('T', ' ');
 }
\ No newline at end of file