I believe you haven’t configured the Managed Servers. Please add the Managed Servers for your account with which you are logging in.
Please follow the below steps before publishing any block as web service.
1) Open the Report in the Design Mode and select the Web Service Publisher in the left corner.
2) Select the Managed Servers button on right side of the panel and Click the Add Button.
3) Enter your Server Host name and modify your port number with your server port number in URL section and wait to get the green check and then click ok.
4) Publish the web service. Now onwards this web service host will be the default for this account.
and you can be able to publish web services.