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Call to undefined function: sha1():

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The Php function sha1() is required by LinkMachine in order to access Alexa rank information. This function is only available in versions of Php greater than or equal to 4.3.0. If you receive this error message, we recommend asking your web host's tech support to upgarde the Php installation on your server to version 4.3.0 or later. If they are unwilling or unable to do this, we recommend turning off the Alexa rank display by going to Change Settings, Interface Settings, and un-checking the box labelled Show the Alexa Rank of Each Site.

Other questions in this category:

	Can I hide every trace that my link pages were generated by LinkMachine?
	What write permissions values should I set, and for which files and directories?
	How do I change the write permissions of a file or directory?
	How can I direct my visitors to a page where they can request a link exchange with my site?
	How do I change which directory my link pages are generated within, or the filenames of the link pages?
	What is the address (url) of the link pages generated on my site by LinkMachine?
	I've created a custom template for my link pages. This template page has several images on it. However on the link pages that are generated based on the template, these images are broken and do not display. What's wrong?
	When I try to upload a page template file to LinkMachine, I get an error message saying "Invalid template filename". What's wrong?
	How can I back up my site's LinkMachine link data?
	All of my link pages include a link at the bottom, "Powered by LinkMachine". Can I get rid of this link?
	Immediately after logging in to LinkMachine, when I click on any link, I am logged out, and asked to log in again. Why?
	I've sent out some link exchange invitation e-mails - but the edit link included in these e-mails doesn't work. This is the link specified by %EDITURL% in the e-mail template. What's wrong?
	I've had LinkMachine check for reciprocal links, and there's one site that definitely does have a link back to my site, but LinkMachine set its status to Link-back missing anyway. Why isn't LinkMachine recognizing this reciprocal link?
	What if you go out of business? Will my copy of LinkMachine still work?
	Under Site Settings, what should I enter as the title of my site?
	I need to add a link from my home page to my link directory so that visitors and search engines can find it. But, I don't know how to add a link to a web page. What should I do?
	My site has many links pointing to it, but its Google PageRank is still zero. What's wrong?
	I would like each page in my link directory to have a page title and meta tags that are relevant to the category of links on that particular page. How can I do this with LinkMachine?
	I would like my link pages to be located in my site's root directory, and use a different filename. How do I make LinkMachine do this?
	How can I remove or rename the category called "Other"?
	How do I get back to my LinkMachine admin page? What is its address?
	I am receiving many submissions through my link submission form for PageRank 0 spam sites. How can I prevent this?
	How can I change my LinkMachine user e-mail address and/or password?
	How can I add a logo image to my link pages or make them match the look of my site?
	How can I prevent InstantLinks from being automatically exchanged with my site? I would rather receive invitations instead.
	How can I get in touch with a real person for tech support? Can you be reached by telephone?
	I've added links to LinkMachine, but they are not showing up on my link pages. Why?
	I ran a keyword search to add links, and few or no links were added. Also, SEO Wizard and Link Analyzer are returning very few links. Why?
	How can I have different link partners use a variety of different URLs, descriptions, and/or anchor text in their links to my site?
	Can I use LinkMachine to create 'non-reciprocal' (also known as 'three way' or 'triangular') linking relationships?
	Link From Home Page Not Found
	The process of checking for reciprocal links takes a long while. How can this be sped up?
	Can I use different login e-mail addresses and passwords for various sites on my account?
	My web site is hosted at a different domain (or subdomain) than my link directory. How can I have LinkMachine ask link partners to link to my main web site itself, rather than the domain where my link directory is located?
	My page template uses Php, asp, or SSI (server side includes). These work fine on my link pages, but not on my search results page or the page returned when "Fetch Info" is used on my link submission form. Why?
	I've set up a cron job to automate LinkMachine but the cron job is failing or is returning an error message. How can I fix this?
	One of my sites is listed twice in LinkMachine's Site Manager. Why?
	Can LinkMachine display the link directory on my site's home page?
	How can I remove or change the category or status of multiple sites at one time?
	Using LinkMachine has gradually become very slow; it takes a long time to refresh. How can I speed it up?
	What is a site's "Alexa Rank" and how does it work?
	The "Link URL" sent out in e-mails as the %LINKURL% is incorrect. What's wrong?
	How do I stop LinkMachine from copying to me all e-mails that it sends to other webmasters when is submitted, approved, or rejected?
	What kind of database does LinkMachine use? Am I able to download it and edit directly?
	When trying to import links from a .csv file I receive an error message. Why?
	When exchanging InstantLinks, the number of automatic exchanges plus the number of invitations sent is sometimes fewer than the number of sites I selected. Why?
	Can I change the wording on the link submission form and 'thank you' page, or translate it to a different language?
	Can I remove LinkMachine from one site and free up the site license to be used on another site?
	The CAPTCHA image is not being displayed correctly on my site's link submission form, so visitors are unable to submit links. How can I fix this?
	LinkMachine's SEO Wizard and Link Analyzer take a long while to complete their analysis. Is anything wrong?
	How can I verify that my cron job is set up correctly to execute LinkMachine's automation script?
	I am unable to turn on the CAPTCHA image feature under Link Approval Settings.
	Google PageRank values are not being displayed - I'm seeing n/a/n/a instead. Why?
	My LinkMachine installation is unable to send e-mails. Why?
	I've added categories to LinkMachine, but they are not showing up on my link pages. Why?
	What is the maximum number of links I can add to my LinkMachine database?
	How can I copy my links from one LinkMachine installation to another?
	After clicking 'Check All Sites For Reciprocal Links', LinkMachine always stalls, getting stuck at a particular percentage part-way through the reciprocal link check. How can I prevent it from hanging?
	How do I update the copy of LinkMachine on my site to the latest version?
	The category links on my link pages do not link to the category link pages - the URL is wrong. Why?
	I am selling my site and would like the buyer to be able to use their own LinkMachine account on the site's LinkMachine installation, rather than my account.
	After sending out a batch of link exchange invitation e-mails, my ISP or some of the recipients complained that I sent spam. How can this be prevented?
	I have created a number of categories, and would like to add the same large set of subcategories under each one (for example, states or countries). How can this be done quickly?
	When I add a link to my link directory, does that link always remain on the same page, accessible at the same URL?
	Can I have a different login e-mail and password for each of my LinkMachine installations?
	How can I send an e-mail to all webmasters of all sites I've exchanged links with?
	What is the difference between Automatic InstantLinks and InstantLink Invitations?
	Can you help me to create a custom link page template?
	How can I prevent link submissions from sites that are unrelated to the topic of my site?
	I do not wish to exchange any InstantLinks. How can I prevent InstantLink exchanges from being submitted to my site?
	How can I change the font style or add HTML elements to the e-mails that LinkMachine sends out?
	When adding links, how can I prevent duplicates of existing links from being added?
	When checking for a reciprocal link, does LinkMachine only check a site's Reciprocal Link URL, or does it spider the entire site? Can it find a reciprocal link that has been moved to a different page?
	What do the status codes in a csv data download refer to?
	I've been receiving e-mails with the subject "InstantLink Exchange" or "InstantLink Invitation". What do these mean?
	Some links have been submitted even though they do not meet the criteria that I set on the Link Approval Settings page. Why is this?
	I have exchanged many links using LinkMachine, but Google does not show all of the pages that link to my site. Why?
	What is the URL where I can access the LinkMachine admin log in page on my site?
	I've lost the password for my LinkMachine account. How can I retrieve it?
	Can I have LinkMachine automatically reject invitations to exchange links with a particular domain or invitations submitted by a particular webmaster?
	I've been given the HTML link code to add a link to my site. How do I add that link using LinkMachine?
	How can I create a link page template based on my site's home page (or another page on my site)?