diff --git a/src/scripts/classes/session.ts b/src/scripts/classes/session.ts
index fcc62ee..564f8ea 100644
--- a/src/scripts/classes/session.ts
+++ b/src/scripts/classes/session.ts
@@ -3,9 +3,11 @@
 // Core modules
 import * as fs from "fs";
 import { promisify } from "util";
+import path from "path";
 
 // Public modules from npm
 import md5 from "md5";
+import tough, { CookieJar } from "tough-cookie";
 
 // Promisifed functions
 const areadfile = promisify(fs.readFile);
@@ -19,12 +21,15 @@ export default class Session {
     /**
     * Max number of days the session is valid.
     */
-    private readonly SESSION_TIME: number = 1;
+    private readonly SESSION_TIME: number = 3;
+    private readonly COOKIEJAR_FILENAME: string = "f95cookiejar.json";
     private _path: string;
     private _isMapped: boolean;
     private _created: Date;
     private _hash: string;
     private _token: string;
+    private _cookieJar: CookieJar;
+    private _cookieJarPath: string;
 
     //#endregion Fields
 
@@ -50,18 +55,27 @@ export default class Session {
      * Token used to login to F95Zone.
      */
     public get token() { return this._token; }
+    /**
+     * Cookie holder.
+     */
+    public get cookieJar() { return this._cookieJar; }
 
     //#endregion Getters
 
     /**
      * Initializes the session by setting the path for saving information to disk.
      */
-    constructor(path: string) {
-        this._path = path;
+    constructor(p: string) {
+        this._path = p;
         this._isMapped = fs.existsSync(this.path);
         this._created = new Date(Date.now());
         this._hash = null;
         this._token = null;
+        this._cookieJar = new tough.CookieJar();
+
+        // Define the path for the cookiejar
+        const basedir = path.dirname(p);
+        this._cookieJarPath = path.join(basedir, this.COOKIEJAR_FILENAME);
     }
 
     //#region Private Methods
@@ -122,6 +136,10 @@ export default class Session {
 
         // Write data
         await awritefile(this.path, data);
+
+        // Write cookiejar
+        const serializedJar = await this._cookieJar.serialize();
+        await awritefile(this._cookieJarPath, JSON.stringify(serializedJar));
     }
 
     /**
@@ -134,9 +152,13 @@ export default class Session {
             const json = JSON.parse(data);
 
             // Assign values
-            this._created = json._created;
+            this._created = new Date(json._created);
             this._hash = json._hash;
             this._token = json._token;
+
+            // Load cookiejar
+            const serializedJar = await areadfile(this._cookieJarPath, { encoding: 'utf-8', flag: 'r' });
+            this._cookieJar = await CookieJar.deserialize(JSON.parse(serializedJar));
         }
     }
 
@@ -145,7 +167,11 @@ export default class Session {
      */
     async delete(): Promise<void> {
         if (this.isMapped) {
+            // Delete the session data
             await aunlinkfile(this.path);
+
+            // Delete the cookiejar
+            await aunlinkfile(this._cookieJarPath);
         }
     }
 
@@ -154,18 +180,22 @@ export default class Session {
      */
     isValid(username: string, password: string): boolean {
         // Get the number of days from the file creation
-        const diff = this.dateDiffInDays(new Date(Date.now()), this._created);
+        const diff = this.dateDiffInDays(new Date(Date.now()), this.created);
 
         // The session is valid if the number of days is minor than SESSION_TIME
-        let valid = diff < this.SESSION_TIME;
+        const dateValid = diff < this.SESSION_TIME;
         
-        if(valid) {
-            // Check the _hash
-            const value = `${username}%%%${password}`;
-            valid = md5(value) === this._hash;
-        }
+        // Check the hash
+        const value = `${username}%%%${password}`;
+        const hashValid = md5(value) === this._hash;
 
-        return valid;
+        // Search for expired cookies
+        const jarValid = this._cookieJar
+            .getCookiesSync("https://f95zone.to")
+            .filter(el => el.TTL() === 0)
+            .length === 0;
+
+        return dateValid && hashValid && jarValid;
     }
 
     //#endregion Public Methods
diff --git a/src/scripts/network-helper.ts b/src/scripts/network-helper.ts
index 0d0e701..b35890d 100644
--- a/src/scripts/network-helper.ts
+++ b/src/scripts/network-helper.ts
@@ -4,7 +4,6 @@
 import axios, { AxiosResponse } from "axios";
 import cheerio from "cheerio";
 import axiosCookieJarSupport from "axios-cookiejar-support";
-import tough from "tough-cookie";
 
 // Modules from file
 import shared from "./shared.js";
@@ -21,13 +20,25 @@ const userAgent = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15) " +
 // @ts-ignore
 axiosCookieJarSupport.default(axios);
 
+/**
+ * Common configuration used to send request via Axios.
+ */
 const commonConfig = {
+    /**
+     * Headers to add to the request.
+     */
     headers: {
         "User-Agent": userAgent,
         "Connection": "keep-alive"
     },
+    /**
+     * Specify if send credentials along the request.
+     */
     withCredentials: true,
-    jar: new tough.CookieJar() // Used to store the token in the PC
+    /**
+     * Jar of cookies to send along the request.
+     */
+    jar: shared.session.cookieJar,
 };
 
 /**
@@ -38,6 +49,7 @@ export async function fetchHTML(url: string): Promise<Result<GenericAxiosError |
     const response = await fetchGETResponse(url);
 
     if (response.isSuccess()) {
+        // Check if the response is a HTML source code
         const isHTML = response.value.headers["content-type"].includes("text/html");
 
         const unexpectedResponseError = new UnexpectedResponseContentType({
@@ -93,7 +105,7 @@ export async function authenticate(credentials: credentials, force: boolean = fa
 
             // Return the result of the authentication
             const result = errorMessage.trim() === "";
-            const message = errorMessage.trim() === "" ? "Authentication successful" : errorMessage;
+            const message = result ? "Authentication successful" : errorMessage;
             return new LoginResult(result, message);
         }
         else throw response.value;
@@ -127,6 +139,7 @@ export async function fetchGETResponse(url: string): Promise<Result<GenericAxios
 
     try {
         // Fetch and return the response
+        commonConfig.jar = shared.session.cookieJar;
         const response = await axios.get(secureURL, commonConfig);
         return success(response);
     } catch (e) {
@@ -142,10 +155,10 @@ export async function fetchGETResponse(url: string): Promise<Result<GenericAxios
 
 /**
  * Enforces the scheme of the URL is https and returns the new URL.
- * @returns {String} Secure URL or `null` if the argument is not a string
  */
 export function enforceHttpsUrl(url: string): string {
-    return isStringAValidURL(url) ? url.replace(/^(https?:)?\/\//, "https://") : null;
+    if (isStringAValidURL(url)) return url.replace(/^(https?:)?\/\//, "https://");
+    else throw new Error(`${url} is not a valid URL`);
 };
 
 /**
@@ -159,7 +172,6 @@ export function isF95URL(url: string): boolean {
  * Checks if the string passed by parameter has a 
  * properly formatted and valid path to a URL (HTTP/HTTPS).
  * @param {String} url String to check for correctness
- * @returns {Boolean} true if the string is a valid URL, false otherwise
  */
 export function isStringAValidURL(url: string): boolean {
     // Many thanks to Daveo at StackOverflow (https://preview.tinyurl.com/y2f2e2pc)
@@ -217,6 +229,7 @@ export async function fetchPOSTResponse(url: string, params: { [s: string]: stri
     for (const [key, value] of Object.entries(params)) urlParams.append(key, value);
 
     // Shallow copy of the common configuration object
+    commonConfig.jar = shared.session.cookieJar;
     const config = Object.assign({}, commonConfig);
 
     // Remove the cookies if forced