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POCaptcha doesn't display, getting different errors in different browsers
 

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  1. POCaptcha doesn't display, getting different errors in different browsers
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    <p>I run this on one server and I can see the captcha image.</p> <p>On an other server I am not getting the image.</p> <p>Chrome reports no response received, while mozilla showing connection timed out.</p> <p>When I comment out the line <code>header('content-type'...</code>, both are displaying garbage values, so I doubt, that the script does not generate proper header content type on that particular server.</p> <pre><code>&lt;?php ob_start(); session_start(); $image_width = 120; $image_height = 35; $characters_on_image = 6; $dir = dirname(__FILE__); function hexrgb ($hexstr) { $int = hexdec($hexstr); return array("red" =&gt; 0xFF &amp; ($int &gt;&gt; 0x10), "green" =&gt; 0xFF &amp; ($int &gt;&gt; 0x8), "blue" =&gt; 0xFF &amp; $int); } $font = $dir.'/monofont.ttf'; $possible_letters = '23456789bcdfghjkmnpqrstvwxyz'; $random_dots = 0; $random_lines = 20; $captcha_text_color="0x142864"; $captcha_noice_color = "0x142864"; $code = ''; $i = 0; while ($i &lt; $characters_on_image) { $code .= substr($possible_letters, mt_rand(0, strlen($possible_letters)-1), 1); $i++; } $_SESSION['captcha']=$code; $font_size = $image_height * 0.75; $image = @imagecreate($image_width, $image_height); /* setting the background, text and noise colours here */ $background_color = imagecolorallocate($image, 255, 255, 255); $arr_text_color = hexrgb($captcha_text_color); $text_color = imagecolorallocate($image, $arr_text_color['red'],$arr_text_color['green'], $arr_text_color['blue']); $arr_noice_color = hexrgb($captcha_noice_color); $image_noise_color = imagecolorallocate($image, $arr_noice_color['red'],$arr_noice_color['green'], $arr_noice_color['blue']); /* generating the dots randomly in background */ for( $i=0; $i&lt;$random_dots; $i++ ) { imagefilledellipse($image, mt_rand(0,$image_width),mt_rand(0,$image_height), 2, 3, $image_noise_color); } /* generating lines randomly in background of image */ for( $i=0; $i&lt;$random_lines; $i++ ) { imageline($image, mt_rand(0,$image_width), mt_rand(0,$image_height),mt_rand(0,$image_width), mt_rand(0,$image_height), $image_noise_color); } /* create a text box and add 6 letters code in it */ $textbox = imagettfbbox($font_size, 0, $font, $code); $x = ($image_width - $textbox[4])/2; $y = ($image_height - $textbox[5])/2; imagettftext($image, $font_size, 0, $x, $y, $text_color, $font , $code); header('Content-Type: image/png'); imagepng($image); imagedestroy($image); exit; ?&gt; </code></pre>
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      1. POCaptcha doesn't display, getting different errors in different browsers
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    1. COAnyone can reply ?
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    2. COIn one of my system i can see the captcha image properly if i run this captha.php code . But in another network, on chrome it gives " no data received ", in firefox "Connection timeedout" error . Why this strange behaviour
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    3. COThe server is on Yahoo small business !
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