Skip to content
    Moz logo Menu open Menu close
    • Products
      • Moz Pro
      • Moz Pro Home
      • Moz Local
      • Moz Local Home
      • STAT
      • Moz API
      • Moz API Home
      • Compare SEO Products
      • Moz Data
    • Free SEO Tools
      • Domain Analysis
      • Keyword Explorer
      • Link Explorer
      • Competitive Research
      • MozBar
      • More Free SEO Tools
    • Learn SEO
      • Beginner's Guide to SEO
      • SEO Learning Center
      • Moz Academy
      • MozCon
      • Webinars, Whitepapers, & Guides
    • Blog
    • Why Moz
      • Digital Marketers
      • Agency Solutions
      • Enterprise Solutions
      • Small Business Solutions
      • The Moz Story
      • New Releases
    • Log in
    • Log out
    • Products
      • Moz Pro

        Your all-in-one suite of SEO essentials.

      • Moz Local

        Raise your local SEO visibility with complete local SEO management.

      • STAT

        SERP tracking and analytics for enterprise SEO experts.

      • Moz API

        Power your SEO with our index of over 44 trillion links.

      • Compare SEO Products

        See which Moz SEO solution best meets your business needs.

      • Moz Data

        Power your SEO strategy & AI models with custom data solutions.

      NEW Keyword Suggestions by Topic
      Moz Pro

      NEW Keyword Suggestions by Topic

      Learn more
    • Free SEO Tools
      • Domain Analysis

        Get top competitive SEO metrics like DA, top pages and more.

      • Keyword Explorer

        Find traffic-driving keywords with our 1.25 billion+ keyword index.

      • Link Explorer

        Explore over 40 trillion links for powerful backlink data.

      • Competitive Research

        Uncover valuable insights on your organic search competitors.

      • MozBar

        See top SEO metrics for free as you browse the web.

      • More Free SEO Tools

        Explore all the free SEO tools Moz has to offer.

      NEW Keyword Suggestions by Topic
      Moz Pro

      NEW Keyword Suggestions by Topic

      Learn more
    • Learn SEO
      • Beginner's Guide to SEO

        The #1 most popular introduction to SEO, trusted by millions.

      • SEO Learning Center

        Broaden your knowledge with SEO resources for all skill levels.

      • On-Demand Webinars

        Learn modern SEO best practices from industry experts.

      • How-To Guides

        Step-by-step guides to search success from the authority on SEO.

      • Moz Academy

        Upskill and get certified with on-demand courses & certifications.

      • MozCon

        Save on Early Bird tickets and join us in London or New York City

      Unlock flexible pricing & new endpoints
      Moz API

      Unlock flexible pricing & new endpoints

      Find your plan
    • Blog
    • Why Moz
      • Digital Marketers

        Simplify SEO tasks to save time and grow your traffic.

      • Small Business Solutions

        Uncover insights to make smarter marketing decisions in less time.

      • Agency Solutions

        Earn & keep valuable clients with unparalleled data & insights.

      • Enterprise Solutions

        Gain a competitive edge in the ever-changing world of search.

      • The Moz Story

        Moz was the first & remains the most trusted SEO company.

      • New Releases

        Get the scoop on the latest and greatest from Moz.

      Surface actionable competitive intel
      New Feature

      Surface actionable competitive intel

      Learn More
    • Log in
      • Moz Pro
      • Moz Local
      • Moz Local Dashboard
      • Moz API
      • Moz API Dashboard
      • Moz Academy
    • Avatar
      • Moz Home
      • Notifications
      • Account & Billing
      • Manage Users
      • Community Profile
      • My Q&A
      • My Videos
      • Log Out

    The Moz Q&A Forum

    • Forum
    • Questions
    • Users
    • Ask the Community

    Welcome to the Q&A Forum

    Browse the forum for helpful insights and fresh discussions about all things SEO.

    1. Home
    2. SEO Tactics
    3. Technical SEO
    4. 4XX Errors - Adding %5c%5c to Links

    Moz Q&A is closed.

    After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.

    4XX Errors - Adding %5c%5c to Links

    Technical SEO
    3
    7
    2561
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as question
    Log in to reply
    This topic has been deleted. Only users with question management privileges can see it.
    • potpiegirl
      potpiegirl last edited by

      Hi all  😃

      Hope someone can help me with this.

      The internal links on my hubby's business site occasionally break and add %5c%5c%5c endlessly to the end of the url - like this:

      site.com/about/hours-of-operation/\\\\\\\\%

      I cannot for the life of me figure out why it is doing this and while it has happened to me from time to time, I can't recreate it.

      My crawl diagnostics here in my SEOMox campaign show 19-20 urls doing this - it's nuts.

      Any insight?

      Thank you!!

      Jennifer

      ~PotPieGirl

      1 Reply Last reply Reply Quote 0
      • potpiegirl
        potpiegirl @irvingw last edited by

        Both Shane and I looked and neither of saw any / vs \ issues.

        Then, I just took a peek at my source code and look what I saw:

        http://screencast.com/t/y02R4RS2L

        Think that is it?

        Thanks for replying!

        Jennifer

        1 Reply Last reply Reply Quote 0
        • potpiegirl
          potpiegirl @potpiegirl last edited by

          Sent you a PM, Shane - thanks so much for the offer!

          By "occasionally break", I mean that every now and again, any link on the site will freak out and add the %5c jibberish to the end.

          Jennifer

          1 Reply Last reply Reply Quote 0
          • Jinx14678
            Jinx14678 @potpiegirl last edited by

            It would really have to be....

            The only reason for a %5C is the use of backslash - as that is actually what it means in code.

            **business site occasionally break **

            How do you mean "break" ?

            My crawl diagnostics here in my SEOMox campaign show 19-20 urls doing this - it's nuts.

            Is the only issue from this in SEOMOZ reports?

            If you would like to PM me the site I can attempt to profile it

            1 Reply Last reply Reply Quote 1
            • potpiegirl
              potpiegirl @Jinx14678 last edited by

              Thanks for replying so quickly, Shane!

              I don't believe it's a / vs \ issue.  It's a wordpress site.  Key pages are in the top nav bar (all urls correct) and all the side bar links are 'widgets' and created by Wordpress.

              For some reason I am suspecting a theme issue, but if I can't recreate the error, I'll have no way of knowing if changing the theme solves the problem.

              Site has been online since 2010 with no issues...this is a new issue (past couple months according to crawl diagnostics).

              Thanks!!!

              Jinx14678 potpiegirl 2 Replies Last reply Reply Quote 0
              • irvingw
                irvingw last edited by

                somewhere in your url coding you added backslash instead of slash which is not valid.

                potpiegirl 1 Reply Last reply Reply Quote 1
                • Jinx14678
                  Jinx14678 last edited by

                  It appears from research it is actually \   (backslash)  not / (slash)

                  So possibly somewhere in your site you have used \ instead of /  but of course this is just a possibility, as it appears that %5C is the delimiter or interpretation of \ in original Unix.

                  Hope this helps

                  PS a quick check at http://www.w3schools.com/tags/ref_urlencode.asp verified %5c is URL encode, for backslash - as it is treated as a special character, so somewhere in your CMS or code, you have used backslash instead of slash.

                  potpiegirl 1 Reply Last reply Reply Quote 1
                  • 1 / 1
                  • First post
                    Last post

                  Got a burning SEO question?

                  Subscribe to Moz Pro to gain full access to Q&A, answer questions, and ask your own.


                  Start my free trial


                  Browse Questions

                  Explore more categories

                  • Moz Tools

                    Chat with the community about the Moz tools.

                  • SEO Tactics

                    Discuss the SEO process with fellow marketers

                  • Community

                    Discuss industry events, jobs, and news!

                  • Digital Marketing

                    Chat about tactics outside of SEO

                  • Research & Trends

                    Dive into research and trends in the search industry.

                  • Support

                    Connect on product support and feature requests.

                  • See all categories

                  Related Questions

                  • Liggins

                    Updating inbound links vs. 301 redirecting the page they link to

                    Hi everyone, I'm preparing myself for a website redesign and finding conflicting information about inbound links and 301 redirects. If I have a URL (we'll say website.com/website) that is linked to by outside sources, should I get those outside sources to update their links when I change the URL to website.com/webpage? Or is it just as effective from a link juice perspective to simply 301 redirect the old page to the new page? Are there any other implications to this choice that I may want to consider? Thanks!

                    Technical SEO | | Liggins
                    0
                  • greenfoxone

                    Dofollow and Nofollow links

                    What is the difference between dofollow and nofollow links? I know that some sites/blogs only let you post nofollow links. In such a case how do I know if a comment I posted on a certain site will be a nofollow or dofollow? How about big traffic sites such as Huff Post. Do they only allow nofollow links?

                    Technical SEO | | greenfoxone
                    0
                  • KLLC

                    What is link Schemes?

                    Hello Friends, Today I am reading about link schemes on http://support.google.com/webmasters/bin/answer.py?hl=en&answer=66356 there are a several ways how to avoid Google penalties and also talk about the low quality links. But I can't understand about  "Low-quality directory or bookmark site links" Is there he talked about low page rank, Alexa or something else?

                    Technical SEO | | KLLC
                    0
                  • Uds

                    Links from the same server has value or not

                    Hi Guys, Sometime ago one of the SEO experts said to me if I get links from the same IP address, Google doesn't count them as with much value. For an example, I am a web devleoper and I host all my clients websites on one server and link them back to me. Im wondering whether those links have any value when it comes to seo or should I consider getting different hosting providers? Regards Uds

                    Technical SEO | | Uds
                    0
                  • EwanFisher

                    International Site Links In Footer

                    We have several international sites and we have them linked in the footer of our main .com site . Should we add "nofollow" to these links? Our concern is that Google could see these sites as a network?

                    Technical SEO | | EwanFisher
                    0
                  • EugeneF

                    404 crawl errors from "tel:" link?

                    I am seeing thousands of 404 errors.  Each of the urls is like this: abc.com/abc123/tel:1231231234 Everything is normal about that url except the "/tel:1231231234" these urls are bad with the tel: extension, they are good without it. The only place I can find this character string is on each page we have this code which is used for Iphones and such.  What are we doing wrong? Code: Phone: <a href="[tel:1231231234](tel:7858411943)"> (123) 123-1234a>

                    Technical SEO | | EugeneF
                    0
                  • amit.ganguly

                    How to remove the 4XX Client error,Too many links in a single page Warning and Cannonical Notices.

                    Firstly,I am getting around 12 Errors in the category 4xx Client error. The description says that this is either bad or a broken link.How can I repair this ? Secondly, I am getting lots of warnings related to too many page links of a single page.I want to know how to tackle this ? Finally, I don't understand the basics of Cannonical notices.I have around 12 notices of this kind which I want to remove too. Please help me out in this regard. Thank you beforehand. Amit Ganguly http://aamthoughts.blogspot.com   - Sustainable Sphere

                    Technical SEO | | amit.ganguly
                    0
                  • jwdesign

                    Is link cloaking bad?

                    I have a couple of affiliate gaming sites and have been cloaking the links, the reason I do this is to stop have so many external links on my sites. In the robot.txt I tell the bots not to index my cloaked links. Is this bad, or doesnt it really matter? Thanks for your help.

                    Technical SEO | | jwdesign
                    0

                  Get started with Moz Pro!

                  Unlock the power of advanced SEO tools and data-driven insights.

                  Start my free trial
                  Products
                  • Moz Pro
                  • Moz Local
                  • Moz API
                  • Moz Data
                  • STAT
                  • Product Updates
                  Moz Solutions
                  • SMB Solutions
                  • Agency Solutions
                  • Enterprise Solutions
                  Free SEO Tools
                  • Domain Authority Checker
                  • Link Explorer
                  • Keyword Explorer
                  • Competitive Research
                  • Brand Authority Checker
                  • Local Citation Checker
                  • MozBar Extension
                  • MozCast
                  Resources
                  • Blog
                  • SEO Learning Center
                  • Help Hub
                  • Beginner's Guide to SEO
                  • How-to Guides
                  • Moz Academy
                  • API Docs
                  About Moz
                  • About
                  • Team
                  • Careers
                  • Contact
                  Why Moz
                  • Case Studies
                  • Testimonials
                  Get Involved
                  • Become an Affiliate
                  • MozCon
                  • Webinars
                  • Practical Marketer Series
                  • MozPod
                  Connect with us

                  Contact the Help team

                  Join our newsletter
                  Moz logo
                  © 2021 - 2025 SEOMoz, Inc., a Ziff Davis company. All rights reserved. Moz is a registered trademark of SEOMoz, Inc.
                  • Accessibility
                  • Terms of Use
                  • Privacy

                  Looks like your connection to Moz was lost, please wait while we try to reconnect.