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    <p>Username and password need to be encoded using Base64 encoding when using Basic HTTP authentication.</p> <p>From <a href="http://en.wikipedia.org/wiki/Basic_access_authentication" rel="nofollow">Wikipedia's Article on that subject</a>:</p> <blockquote> <p>Client side</p> <p>When the user agent wants to send the server authentication credentials it may use the Authorization header.</p> <p>The Authorization header is constructed as follows:[6] Username and password are combined into a string "username:password"</p> <p>The resulting string literal is then encoded using Base64</p> <p>The authorization method and a space i.e. "Basic " is then put before the encoded string. For example, if the user agent uses 'Aladin' as the username and 'sesam open' as the password then the header is formed as follows:</p> </blockquote> <pre><code>Authorization: Basic QWxhZGluOnNlc2FtIG9wZW4= </code></pre> <hr> <p>See this corrected code:</p> <pre><code>[...] NSString *str1 = [NSString stringWithFormat:@"%@:%@",userName,password]; NSString *encodedString = [self stringByBase64EncodingWithString:str1]; [request addValue:[NSString stringWithFormat:@"Basic %@",encodedString] forHTTPHeaderField:@"Authorization"]; [...] - (NSString *)stringByBase64EncodingWithString:(NSString *)inString { NSData *data = [NSData dataWithBytes:[inString UTF8String] length:[inString lengthOfBytesUsingEncoding:NSUTF8StringEncoding]]; NSUInteger length = [data length]; NSMutableData *mutableData = [NSMutableData dataWithLength:((length + 2) / 3) * 4]; uint8_t *input = (uint8_t *)[data bytes]; uint8_t *output = (uint8_t *)[mutableData mutableBytes]; for (NSUInteger i = 0; i &lt; length; i += 3) { NSUInteger value = 0; for (NSUInteger j = i; j &lt; (i + 3); j++) { value &lt;&lt;= 8; if (j &lt; length) { value |= (0xFF &amp; input[j]); } } static uint8_t const base64EncodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; NSUInteger idx = (i / 3) * 4; output[idx + 0] = base64EncodingTable[(value &gt;&gt; 18) &amp; 0x3F]; output[idx + 1] = base64EncodingTable[(value &gt;&gt; 12) &amp; 0x3F]; output[idx + 2] = (i + 1) &lt; length ? base64EncodingTable[(value &gt;&gt; 6) &amp; 0x3F] : '='; output[idx + 3] = (i + 2) &lt; length ? base64EncodingTable[(value &gt;&gt; 0) &amp; 0x3F] : '='; } return [[NSString alloc] initWithData:mutableData encoding:NSASCIIStringEncoding]; } </code></pre>
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