If you find that your flexd isn't properly working, scroll down to line 120
where it says:
char  buffer[256], port[14], path[AX25_MAX_DIGIS*10]
and adjust the buffer per your neighbor's screens. The formula is:
2 data frames: 256
3 data frames: 512
4 data frames: 1024

Unfortunately the configure script can't autosense this because in some
cases, flexd doesn't already exist yet. To determine how many frames you're
receiving, use the (ax)listen tool and count the frames after making a manual
connect. Ex:
ax2: fm N1URO-15 to N1URO-1 ctl SABM+ 
ax2: fm N1URO-1 to N1URO-15 ctl UA- 
ax2: fm N1URO-1 to N1URO-15 ctl I00^ pid=F0(Text) len 256 
0000  PC/FlexNet V3.3g - Welcome to the N1URO FlexNet-Digi. This node 
0040  is located at .Unionville, Hartford County, Connecticut [FN31ns]
0080  . This version of pc/Flexnet.and all related services are hosted
00C0   under the Linux operating system. Enjoy!..Basic commands are:.<
ax2: fm N1URO-1 to N1URO-15 ctl I01^ pid=F0(Text) len 176 
0000  A>rea destinations file.<C>onnect <desti>.<D>estinations list..<
0040  H>elp (more detailed command list).<L>inks.list...<M>ailBox (BBS
0080  URO:N1URO-4).<Q>uit this node..<T>alk <call>..=>

Here I made a manual connect from my URONode to my pc/FlexNet node.
After the protocol handshakes there's 2 frames prior to the => prompt.
So using the formula above, my line needs to be 256 for the buffer size.

Hope this may help those with flexd errors.
73 de Brian N1URO