/etc/logcheck/ignore.d.server/pptpd is in logcheck-database 1.3.17.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pptpd\[[0-9]+\]: CTRL: Client [.0-9]{5,17} control connection (started|finished)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pptpd\[[0-9]+\]: CTRL: Starting call \(launching pppd, opening GRE\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pptpd\[[0-9]+\]: CTRL: Ignored a SET LINK INFO packet with real ACCMs!$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pptpd\[[0-9]+\]: CTRL: Reaping child PPP\[[0-9]+\]$
# typical errors on network disconnection
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pptpd\[[0-9]+\]: CTRL: PTY read or GRE write failed \(pty,gre\)=\([0-9]+,[0-9]+\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pptpd\[[0-9]+\]: CTRL: CTRL read failed$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pptpd\[[0-9]+\]: CTRL: EOF or bad error reading ctrl packet length\.$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pptpd\[[0-9]+\]: CTRL: couldn't read packet header \(exit\)$
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pptpd\[[0-9]+\]: GRE: read\(fd=[0-9]+,buffer=[0-9a-f]+,len=[0-9]+\) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs$
# client bug
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ pptpd\[[0-9]+\]: GRE: Discarding duplicate packet$
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