Error adding WMS server

[KostasKon]

Greetings everyone,

The issue that i am dealing with WMS is the following:

    When I tried to add a wms server in ArcCatalog, the following message came up: "Unidentified error" . The WMS Server is the following http://gis.ktimanet.gr/wms/wmsopen/wmsserver.aspx. I use ArcGis 10.1.
Any ideas?

Thank you in advance for all the answers.

[RichardWatson]

I haven't a clue what the problem is. 

Suggestions:
1) Validate that the WMS server is working correctly by using another tool/viewer.
2) Use a tool such as Fiddler in order to view the HTTP traffic, i.e. debug the problem. 

Best of luck!

[StevenMoore1]

Try adding a question mark to the end of the URL so it looks like this:

http://gis.ktimanet.gr/wms/wmsopen/wmsserver.aspx?

That works for me in ArcCatalog.