Red Hat Bugzilla – Bug 68192
Nmap finds no open ports
Last modified: 2008-05-01 11:38:02 EDT
Description of problem: Nmap finds no open port Version-Release number of selected component (if applicable): nmap-2.54BETA34-3 nmap-frontend-2.54BETA34-3 How reproducible: Always Steps to Reproduce: Start nmapfe (preferable as root) and scan a known host with known open ports on it (to verify the result later). Actual Results: For any host, except localhost (127.0.0.1), nmap finds that "all 1556 scanned ports on (_chosen_host_) are: filtered" even though there are open ports there. Expected Results: Nmap should show the open ports
I cannot reproduce it with the Limbo Beta... Can you retry it with another host? nmap-2.54.36-1 is worth another try.
I am pretty much sure, that the whole thing is a compiler issue: I've compiled nmap sources on both, Red Hat 7.3 and "limbo". The whole compilation takes a few seconds on RH 7.3 and essentially longer with a universe of warnings on "limbo" which comes with gcc 3.1.x. Finally, nmap compiled on RH 7.3 works with all versions of it. On the other hand, no version of nmap compiled on "limbo" with gcc 3.1.x does work properly. In the latter case it finds open (but not filtered) ports on localhost and a machine on a "private" network (e.g., 192.168.0.x) directly connected to the initial box. Although "ping" and "traceroute", "dig" etc. and other network services work fine, nmap does not find any open ports on a machine which is somewhere on the internet. Stracing the whole thing on "limbo" with "-o logbook" gives a lot of messages of type: select(5, [4], NULL, NULL, {0, 20000}) = 0 (Timeout) gettimeofday({1026139456, 651161}, NULL) = 0 in the logbook where the numbers in the latter line differ from attempt to attempt.
(The 1539 ports scanned but not shown below are in state: closed) Port State Service 22/tcp open ssh 25/tcp open smtp 53/tcp open domain 80/tcp open http 111/tcp filtered sunrpc 113/tcp open auth 135/tcp filtered loc-srv 139/tcp filtered netbios-ssn 443/tcp open https 445/tcp filtered microsoft-ds 465/tcp open smtps 651/tcp open unknown 993/tcp open imaps 995/tcp open pop3s 3306/tcp open mysql 10000/tcp open snet-sensor-mgmt 27374/tcp filtered subseven Nmap run completed -- 1 IP address (1 host up) scanned in 50 seconds Works fine for me.
Tested the whole thing today again (about five different install sessions on different machines). It worked fine, what a surprise (!) although for my first 3-5 install sessions - also on different machines - it didn't work. Can't figure out what exactly the problem is since all install sessions went through without errors ... it's like russian roulette ... maybe a dependency problem of different packages. 'Give up ... sorry for bothering.
BTW, what is bug 67218 about ... I "do not have the permissions necessary to see bug 67218" ???