Closing connections idle longer than 30000 MILLISECONDS

Hello,

We have a Sonatype Nexus Repository Manager OSS 3.23.0-03 installed and every 5 seconds the following messages are written on the nexus.log

We already put the log level on DEBUG Level but we can find any justification for this message:

2020-08-06 10:13:43,371+0100 DEBUG [nexus-httpclient-eviction-thread] *SYSTEM org.sonatype.nexus.internal.httpclient.SharedHttpClientConnectionManager - Closing expired connections
2020-08-06 10:13:43,371+0100 DEBUG [nexus-httpclient-eviction-thread] *SYSTEM org.sonatype.nexus.internal.httpclient.SharedHttpClientConnectionManager - Closing connections idle longer than 30000 MILLISECONDS

On the admin console appears a message saying: “Server disconnected: There is a problem communicating with the server”.

Anybody had a similar issue, can give any clue of what might cause this issue, or where these timeouts are defined?

Best regards,
Ant

Likely a proxy or reverse proxy is interferring with the connection. There are some example configurations in the help documentation - https://help.sonatype.com/repomanager3/installation/run-behind-a-reverse-proxy