Apache or something else blocking connections from Java clients?
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  1. Tomas
  2. Thursday, 21 January 2021
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We have a rather strange issue. We use client applications that connect to our website (via ssl) where the application verifies is the customer has a valid password etc.

Basically, the client application, when it's launched, checks a very simple page on our server. Some versions of the client apps are running on Java. After server update a few days ago, some of those users can no longer connect via the app. These packages were updated:

Jan 19 02:54:34 Updated: 1:liblsapi-1.1-55.el7.cloudlinux.x86_64
Jan 19 02:54:35 Updated: 1:ea-apache24-mod_lsapi-1.1-55.el7.cloudlinux.x86_64
Jan 19 02:54:35 Updated: 1:liblsapi-devel-1.1-55.el7.cloudlinux.x86_64
Jan 19 02:54:36 Updated: alt-php-ssa-0.1-7.el7.x86_64

Is it possible apache is blocking access perhaps if it is sees the user-agent is an old java version or something like that? No useful info in any error log though.
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  1. 21.01.2021 14:01:55
  2. # 1
Posts: 257
Joined: 31.01.2017
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Hi Tomas,

I'd use a packet tracer (e.g. tcpdump or wireshark) from either side to debug the communication - this may shed some light on the issue if no logs are available.
  1. 21.01.2021 15:01:17
  2. # 2
Tomas Accepted Answer
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Joined: 21.01.2021
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Thanks, testing that right now with our programmer. I do see some packets during the connection attempt and kernel does not seem to be blocking though. So so far not much new info...
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