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"Illegal character 0x0 in state=METHOD" when trying to connect to localhost

Hello, People!
I have the latest version of JMC, but when I try to connect to an application running on localhost, I get the following error messages:
[qtp1935621678-137] WARN org.eclipse.jetty.http.HttpParser - Illegal character 0x0 in state=METHOD for buffer [email protected][p=5,l=7,c=8192,r=2]={JRMI\x00<<<\x02K>>>\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00...\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00}
[qtp1935621678-137] WARN org.eclipse.jetty.http.HttpParser - bad HTTP parsed: 400 Illegal character 0x0 for [email protected]{r=0,c=false,a=IDLE,uri=null}
[qtp1935621678-134] WARN org.eclipse.jetty.http.HttpParser - Illegal character 0x16 in state=START for buffer [email protected][p=1,l=452,c=8192,r=451]={\x16<<<\x03\x03\x01\xBf\x01\x00\x01\xBb\x03\x03]*s\xC4?J\xFe...E"\xCf\x94\xD7v\xFaQ\x19(&\r\xAe\n\xBf>>>\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00...\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00}
[qtp1935621678-134] WARN org.eclipse.jetty.http.HttpParser - bad HTTP parsed: 400 Illegal character 0x16 for [email protected]{r=0,c=false,a=IDLE,uri=null}
Can somebody please help?