Blocked ports on ADSL connection.

Posted on 2006-04-19
Last Modified: 2013-12-14
I have a remote user who’s Citrix connection has stopped working but still has regular Internet access with other problems.
A notebook that usually works with Citrix is also having the same problem at the same remote site.

I suspect that the Citrix port 1494 is being blocked by the ADSL carrier (British Telecom) as the ISP Demon Internet have no idea what’s going on.

How can I prove where the connection is being blocked? I have tried a port scanner which just tells me is it can see a port or not. Ping just says destination net unreachable
C:\>pathping  -routers IP address-

Tracing route to [client router IP address]
over a maximum of 30 hops:
  0  apc [Local PC IP address]
  1 [Local router IP address]
  2 []
  3 []  reports: Destination net unreachable.

It looks to me that or what’s behind it is blocking my Citrix traffic as well.

Question by:JPFN
    LVL 12

    Expert Comment

    nothing on your router/firewall has been reset at the site? you prove it by directly connecting device to the modem.. making sure no firewalls are active in the client PC. I would verify this first, then bring it to the attention of the carrier - if it is not them they should be able to prove its NOT.

    as another person said also check the licensing for citrix.
    LVL 7

    Accepted Solution

    Sounds like you have bigger problems than a blocked port.
    If the destination network is unreachable, then it doesn't matter if the port is open or not.

    According to your traceroute, the client network is unreachable - what has changed at that location?


    Author Comment

    It gets better the ISP has now recommended that I use a web proxy to resolve the problem?
    I have given the ISB an ultimatum either they resolve the problem with their router or I get the clients ADSL re-provision with another ISP. It’s a shame as a couple of years back their support was very good now I just get the run round. Quite frankly I wouldn’t trust theses guys to change a light bulb.

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    How to improve team productivity

    Quip adds documents, spreadsheets, and tasklists to your Slack experience
    - Elevate ideas to Quip docs
    - Share Quip docs in Slack
    - Get notified of changes to your docs
    - Available on iOS/Android/Desktop/Web
    - Online/Offline

        Over the past few years, small business and home owners have become so dependent on internet that a need for redundancy has arisen.    What happens when your small business or home / home office loses its internet connection?  The results c…
    Sometimes you have to pull out old tricks to get a new firewall to work… While we were installing a new Sonicwall at a customers site we found that sites they were able to visit before were not working.  It seemed random and we could not understa…
    Migrating to Microsoft Office 365 is becoming increasingly popular for organizations both large and small. If you have made the leap to Microsoft’s cloud platform, you know that you will need to create a corporate email signature for your Office 365…
    Illustrator's Shape Builder tool will let you combine shapes visually and interactively. This video shows the Mac version, but the tool works the same way in Windows. To follow along with this video, you can draw your own shapes or download the file…

    761 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    9 Experts available now in Live!

    Get 1:1 Help Now