RTC server connection dropped, then login problems due to "Unable to find server http://xxx.yyy.com:/jazz"

I'm running v3.0.4 of the RTC plugins on Juno on RedHat Linux.   The precise version of RTC is "Rational Team Concert Client Feature    3.0.4.RTC-I20120326-1442".   

Frequently (several times a day), my server connection is dropped (i.e. red X appears to the left of my repository connection), and when I try to login again, it fails with an "unresolved host" error.   After trying to login several times, it will eventually work.   And this is happening while I can ping the jazz server with no problems.    Once the server connection logout occurs, it's almost like RTC (or Eclipse) has cached the "unresolved host" state and it takes 15-20 seconds for it to realize that the host really does exist.

Anyone else see this problem?   Is there a way to prevent RTC from unceremoniously dropping my server connection?  Is there a way to prevent RTC from incorrectly thinking the host doesn't exist when it clearly does?

Thanks in advance for any help