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Why "no route to host" when it can be pinged?

It's probably running an internal firewall which is set to generate ICMP host unreachable responses on attempts to access blocked ports. It's like the voice saying "nobody in here but us chickens", except computers are much more likely to take such a response literally...

Title Last Comment
Network Hang  
- negative numbers in a netstat -m - the fact that it prints a negative shows that it's signed, so 2147483647 (2^31 - 1) is the largest number it can represent. -

4GB ram problems sco osr5  
- All releases before SCO 507 have a set of behaviors which, while not strictly related to 4GB, tends to cramp the system's style whenever you really _use_ a lot of RAM. -

serial printer hold open scripts with 'cat'  
- It would be even better if there was an input source which the kernel guaranteed to allow you to open, but which never produced any input. Similar to /dev/null, but it should never return from read(). -

scodb crash dump analyze crash  
- Analyzing a crash when the sysdump created is too big for swap by use of "mem=" bootstring (SCO Unix). -

Why no route to host when it can be pinged?  
- If a system can be pinged, why would it say "no route to host" when I try to telnet to it? Where does that come from? -

gunzip File Size Limit Exceeded (core dumped)  
- The size of an individual file is limited to 2GB in OpenServer. Presumably you mean that the unzipped size is ~5GB and the zipped size is smaller? The amount of data that can flow through a pipe is not limited to 2GB. (But it will still fail if any individual file stored in the tar archive is larger than 2GB.) -

tcp connections pseudo ttys NSTRPAGES -->Re No more than230 TCP connections.  
- You need to run `netconfig`, click on "SCO TCP/IP" below your NIC (not the one below "Loopback driver"). Then go to [Protocol -> Modify protocol configuration] and raise the number of TCP connections. You can also raise the number of pseudo ttys here. These thing scost a bit of memory, but not terribly much. Try setting TCP connections to 1024, pseudo ttys to 512. -

Install SCO Unix on non-default division/partition  
- To install anywhere other than the default division-2-of-active-partition requires hackery that few people know -

vmware and old sco image  
- Old SCO 3.2v4.2 in vmware? Obtaining memory map with 'defbootstr prompt' -

Mouse lost on KVM switch  
- Some motherboards just won't work with some KVM switches at all. That's probably a matter of power levels, but it can be very annoying. -

utmpx wtmpx bcheckrc OSR5  
- utmpx wtmpx bcheckrc OSR5 -

dongle needs parallel at 378 address  
- dongle needs parallel at 378 address -

SCO_OSR5 compiling source why the problems?  
- OSR5 compiling source why the problems? -

Pentium 4 overheating OSR5  
- Pentium 4 overheating OSR5 -

How to copy old xenix diskette  
- How the original disk was created could matter. You can get around part of this problem, but not necesaarily easily. -

SCO_OSR5 5.0.7 gigabit broadcom 570x  
- OSR5 5.0.7 gigabit broadcom 570x -

SCO_OSR5 better nfs performance reducing nbuf buffercache  
- OSR5 better nfs performance reducing nbuf buffercache -

3.2v4.2 boot disks n1 n2 m1  
- 3.2v4.2 boot disks n1 n2 m1 -

sed script echo extra argument -->Re misbehavingsed   2010/08/21 Sathish
- sed script echo extra argument -->Re: misbehavingsed -


cpu cache explained -->Re 5.0.5 MP system running slowly with 1Gb RAM  
- Explaining cache design vs. memory amount cached. There is no linear relationship between size of cache and amount of RAM it can cache. This is a common misconception. -

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