This issue is described in this KA: https://bmcsites.force.com/casemgmt/sc_KnowledgeArticle?sfdcid=kA21O000000XQVgSAO&type=Solution
Hope this helps.
Mun Keong Lee, thank you for help!
However, this solution is not specific for my case. The problem you suggest in this KA requires me to be the machine administrator to change the hosts file in system32/drivers/etc and there are no relations with tomcat.
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Does the hostname of your EM server contains _ ? If so, you have to fix your EM server first to get it to work correctly. The EM client talks to the the tomcat server running on your EM server and therefore they are related.
Of course I may be interpreting the KA incorrectly as I did not actually encounter this issue. If you want a confirmation, I suggest you open a case with BMC support.