Let me answer your questions.
Todoay, i tried many times to be connected to the opposite direction (from offfice 2 to office 1)and it was impossible, even after firewall deactivated.What might be the cause.
So long as you use ID connection, the firewall has nothing to do with it. Please, check this KB article to troubleshoot connection issues with ID
At first, something should be clarified to my point of view. I think that changing the roles for a PC from local to remote and vice versa whenever it's required,there shouldn't be any problem.Is it so?
There are two main modules of the software - Viewer and Host, and each plays its only role. Any PC can be both a Viewer and a Host at the same time, of course. The modules do not interfere.
After that connection issues have nothing to do with RU software but only with the internet setting and security software.
If you have been successfully connecting before and all of a sudden a connection no longer works, then yes - it may have something to do with security software. For example, your antivirus software signature database may update and start detecting RU as malware. Just an example.
Viewer is reporting my PC as "offline".
When I try to login manually, viewer tries to login (It took more time as when remote PC is really offline), but after few seconds of displaing LOGON status go back to offline.
I can see my remote PC in the RU server idle connection's list.
Please, check the same KB article I referred to above. Also, make sure that your antivirus software treats the Viewer well, or better just add the Viewer installation path to the exception list in your antivirus program.
Is it problem with license? I cannot register my host using viewer because I cannot log into it
If your Host trial is over you won't be able to connect in a connection mode (like Full Control). However, you 'll be able to simply log in using the "Login" feature in the Viewer. After you log in, use the "Register remote Host" right-click menu item to transfer your license remotely.
By the way, in the version 6.1 update we'll remove "Host registration" altogether. The Host will become a free module. All license management will be done in the Viewer.