"ExtConn timed out while connecting." after upgrading from 1.7.15 to 1.7.19

#1
I've upgraded OLS from openlitespeed-1.7.15-2.el7 to openlitespeed-1.7.19-3.el7 on centos 7, ols started as usual, but as soon as I direct traffic to it the error logs are getting spammed with "ExtConn timed out while connecting.", the site is working fine though.

I use OLS as loadbalancer.

Any idea what could be the issue here?

p.s. when switching to "DEBUG" I also have some "Timeout, partial chunk encoded body received, received: 33029, chunk len: 8192, remain: 7933!" INFO level logs, not sure if this is normal

p.p.s. the ip's mentioned in the extconn error log are always cloudflare ip's (the loadbalancer is behind cloudflare's reverse proxies)
 
#3
I've downgraded from 1.7.19-3.el7 to 1.7.18-2.el7, same Problem.

edit: Looks like the whole issue is related to the host, I just noticed that there are connection issues.
 
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