SharpReader and XP SP2 (or any other firewall)

If you recently installed XP SP2, chances are you've seen the following warning upon starting SharpReader:

This warning occurs because SharpReader by default listens on port 5335 for clicks on Radio UserLand subscribe buttons that are found on many weblogs. If SharpReader is currently running, you can try this one for example to open my weblog in SharpReader:

If you never use this feature, you're free to block SharpReader from opening this port. This will only disable this one feature and will not otherwise affect SharpReader (it will still be able to refresh all your feeds and open web-pages in its internal browser). Alternatively, you can turn this feature (and the associated firewall warning) off by unchecking the cryptic "Listen for subscriptions on port 5335" checkbox in SharpReader's options dialog.
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If SharpReader would listen only on the loopback address (, the Firewall would not interfere.

Posted by Dieter Deyke at August 12, 2004 3:51 PM

How to copy your SharpReader data to another PC
How to copy your SharpReader data to another PC

Trackback from Rolando Ramirez Weblog @ DotNetJunkies at August 13, 2004 6:53 PM

Deyke, you took the words from my mouth (and probably others).. Is there some reason its not listening the loopback address or what is going on?

Posted by Joku at August 21, 2004 3:00 PM

I am Running sharpreader on a windows 98 machine with over 300 megabytes of Ram and for some reason I am getting a low resources message. I have stoped all programs and cleared my tray and this still happens. It seem to happen at random. Got any ideas?

Posted by Carl Pheneger at September 15, 2004 10:59 PM

I know, if I want it I should roll my own, but SharpReader (while fine) should have tabbed browsing.

I know I can use FireFox, but still...

Posted by sweevils at September 20, 2004 8:28 PM

Hi Luke, great product! But I too have the same problem as Carl Peneger. Am also using 98se with 384 RAM I have PC tweaked so 90% or more resources are available. Have installed - uninstalled several times no help. I have only twelve subscribed feeds at present and limit articles to 10 each. Not sure what event causes the gremlin, but it happens often, all of the resources gets sucked out to 00, then with or without error flags 'Invalid parameter''Low Resources'then all resources will slowly climb back up to normal. Usually this program uses only ~ 6% of system & user, 7% of GDI after loading is finished from net. It sometimes happens when I'm scrolling down the newly loaded articles and quite often when nothing is going at all. Opening news items in new window doesn't help 'suckout' problem either. Like something in the program triggers and runs away with itself while nothing at all visible is happening. Hope you can find the handle on this bug.

Posted by Edward Chapman at September 27, 2004 11:17 PM

I cannot read any news feeds. Each of the subscribed feeds has a yellow zig zag line in the icon.

Posted by James Gilman at September 28, 2004 10:59 AM

I have TaskInfo installed, and it raises an alert that GDI resources are low. Apparently SharpReader grabs huge numbers of GDI handles when opening new messages and displaying them. If I exit and restart SharpReader the # of GDI handles returns to a respectable couple of hundred - from thousands!

Posted by BB at September 29, 2004 4:04 PM

First off I'd like to thank you for creating SharpReader.

Secondly, I just want to let you know that I created a slightly different icon for it. Reason being is that I recently downloaded "Aqua Dock" from, which is a spin off of the OSX dock. It does the whole magnification trick and everything, but the standard SharpReader icon became incredibly pixelated when zoomed in, obviously.

So I went ahead and created my own. Feel free to check it out and use it / change it / whatever you want.


Posted by Matt Puchlerz at October 7, 2004 8:22 PM

I love this reader, but as of this morning it no longer works for me.
Last night our administrators installed a patch to XP on my machine. Now, SharpReader has stopped working. (This is not the XP SP2 problem.) Here is what happens:
I get a window that says: Fatal Error
In the window, I see this (parameters removed from method calls. I have to type the contents of the window by hand as someone saw fit to not make it selectable):
Unhandled Exception:
Overflow or underflow in the arithmetic operation.
Stack Trace:
at System.Drawing.Font.Initialize(...)
at System.Drawing.Font..ctor(...)
at System.Windows.Forms.ControlPaint.FontInPoints(...)
at System.Windows.Forms.Control.get_DefaultFont()
at System.Windows.Forms.Control.get_Font()
at System.Windows.Forms.ListView..ctor()
at SharpReader.UI.SharpReaderForm.InitializeComponent() in c:\projects\sharpreader\ui\sharpreaderform.cs:line 392
at SharpReader.UI.SharpReaderForm..ctor() in c:\projects\sharpreader\ui\sharpreaderform.cs:line 234

Posted by Eric Bales at October 28, 2004 2:46 PM

Having a problem recently where the URLs in sharpreader are all changing from the feed that I put in originally to

The original feed URL is gone and I see lots of red feeds and the error
Error reading URL: The underlying connection was closed: The remote name could not be resolved.
Please try to validate this feed. If this feed validates as correct RSS, you can send an error report.
for each.

I have lost 39 out of about 100 feed to this problem/virus?

Any advice?

Posted by psk at November 15, 2004 5:53 PM

I love the SharpReader. After installing it, and the ASP.NET framework, I noticed that my system would no longer logon automatically. Microsoft has released SP1 for the ASP.NET framework, which fixes the problem, or you can use a simple registry key. It's all explained here.

Posted by Brad at December 4, 2004 1:15 PM

First, and foremost I like Sharp reader and I have found nothing to replace it. The only reason I've been looking is waiting for new articles to download is a real pain.
User adjustable ram and hard drive cache buffers that would allow "read ahead" for the current feed and maybe the subsequent feed of unread articles.
Just a thought.

Posted by Tom Lively at February 2, 2005 2:37 AM

I don't understand any of this. Believe me, I ain't dumb. But, Norton and all other such programs wants me to block such programs as this. Almost every site I go to now have RSS Feeds, and I want to be part of it all. But, what is one to do with such mixed messages. Any suggestions regarding this issue, would be great.

Sean Clarke-Redmond

Posted by Seab at June 19, 2005 9:37 PM

As stated in my post above, feel free to allow your firewall to block SharpReader if you're worried about the security implications. SharpReader will work fine either way. The only feature that won't work are the radio userland subscribe buttons, but most sites these days don't use those anyway, and those that do typically have a generic RSS button as well that you can simply drag into SharpReader to subscribe to the feed.

Posted by Luke Hutteman at June 19, 2005 11:06 PM

Sharp Reader works fine when I have my laptop at work, connected to a network.

At home, Sharp Reader doesn't recognize my wireless setup (WiFlyer). WiFlyer has some port trigger settings that might help. Can anyone suggest the port ranges to enter?

Posted by Nina Marable at June 24, 2005 4:38 PM

Hi, just installed (upgraded from a little older version) the latest version.
Unfortunately, just when the program starts up
it gives the error:

The type initializer for "System.Net.HttpWebRequest" threw an exception.

Posted by Jack at July 29, 2005 4:57 PM

That exception is most likely caused because #R requires .NET 1.1 SP1. If you for some reason are unable to install SP1, delete the SharpReader.exe.config
file from the SharpReader directory, and you should be able to run fine
without it (though some wordpress feeds may cause you some issues)


Posted by Luke Hutteman at July 30, 2005 3:03 PM

Just trying this out for the first time (fairly new to the concept and need something to monitor my newly established Trac bug-tracking wikis).

Apart from the fact it is 'free' (donation will likely turn up, if it passes trial), I really appreciate the fact that it is simple, neat and tidy, and can be made unobtrusive (switch off task bar alerts) which makes it ideal for people wanting to 'check in' now and then and not be alerted every few minutes with a ton of irrelevant distractions. After all, I don't want 'news' to be the center of my life!

I do have a suggestion however - could this be set up in future versions?: a) have the ability to drag links onto the taskbar icon without opening the main window and/or b) have a 'Subscribe in SharpReader' right-click context menu in Internet Explorer. It would make it a lot easier to add RSS links if one or both of these features were available.


Posted by Paul Coddington at October 29, 2005 11:42 AM

We have one rss feed which I have subscribed into sharpreader. this feed is a list of latest news which needs user login if they want to read the full news.

We are noticing that , first time we read the news it takes the user to login screen. To test the security we deleted all the cookies for this domain,
tried to read next news. It should again ask for login info but the reader enables the user to read all the news items. We want to know why this is
happening and how can we control the user authentication if we delete the cookies on users machine. This is very important sercurity issue, which
we want to resolve.

Your help will be appreciated.


Posted by madhavi at January 17, 2006 5:02 AM
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